diff --git a/src/addons/mod/assign/feedback/comments/services/handler.ts b/src/addons/mod/assign/feedback/comments/services/handler.ts
index 803865630..6bb08860b 100644
--- a/src/addons/mod/assign/feedback/comments/services/handler.ts
+++ b/src/addons/mod/assign/feedback/comments/services/handler.ts
@@ -60,11 +60,7 @@ export class AddonModAssignFeedbackCommentsHandlerService implements AddonModAss
     }
 
     /**
-     * Discard the draft data of the feedback plugin.
-     *
-     * @param assignId The assignment ID.
-     * @param userId User ID.
-     * @param siteId Site ID. If not defined, current site.
+     * @inheritdoc
      */
     discardDraft(assignId: number, userId: number, siteId?: string): void {
         const id = this.getDraftId(assignId, userId, siteId);
@@ -74,22 +70,14 @@ export class AddonModAssignFeedbackCommentsHandlerService implements AddonModAss
     }
 
     /**
-     * Return the Component to use to display the plugin data.
-     * It's recommended to return the class of the component, but you can also return an instance of the component.
-     *
-     * @returns The component (or promise resolved with component) to use, undefined if not found.
+     * @inheritdoc
      */
     getComponent(): Type<IAddonModAssignFeedbackPluginComponent> {
         return AddonModAssignFeedbackCommentsComponent;
     }
 
     /**
-     * Return the draft saved data of the feedback plugin.
-     *
-     * @param assignId The assignment ID.
-     * @param userId User ID.
-     * @param siteId Site ID. If not defined, current site.
-     * @returns Data (or promise resolved with the data).
+     * @inheritdoc
      */
     getDraft(assignId: number, userId: number, siteId?: string): AddonModAssignFeedbackCommentsDraftData | undefined {
         const id = this.getDraftId(assignId, userId, siteId);
@@ -114,13 +102,7 @@ export class AddonModAssignFeedbackCommentsHandlerService implements AddonModAss
     }
 
     /**
-     * Get files used by this plugin.
-     * The files returned by this function will be prefetched when the user prefetches the assign.
-     *
-     * @param assign The assignment.
-     * @param submission The submission.
-     * @param plugin The plugin object.
-     * @returns The files (or promise resolved with the files).
+     * @inheritdoc
      */
     getPluginFiles(
         assign: AddonModAssignAssign,
@@ -131,14 +113,7 @@ export class AddonModAssignFeedbackCommentsHandlerService implements AddonModAss
     }
 
     /**
-     * Check if the feedback data has changed for this plugin.
-     *
-     * @param assign The assignment.
-     * @param submission The submission.
-     * @param plugin The plugin object.
-     * @param inputData Data entered by the user for the feedback.
-     * @param userId User ID of the submission.
-     * @returns Boolean (or promise resolved with boolean): whether the data has changed.
+     * @inheritdoc
      */
     async hasDataChanged(
         assign: AddonModAssignAssign,
@@ -172,12 +147,7 @@ export class AddonModAssignFeedbackCommentsHandlerService implements AddonModAss
     }
 
     /**
-     * Check whether the plugin has draft data stored.
-     *
-     * @param assignId The assignment ID.
-     * @param userId User ID.
-     * @param siteId Site ID. If not defined, current site.
-     * @returns Boolean or promise resolved with boolean: whether the plugin has draft data.
+     * @inheritdoc
      */
     hasDraftData(assignId: number, userId: number, siteId?: string): boolean | Promise<boolean> {
         const draft = this.getDraft(assignId, userId, siteId);
@@ -186,9 +156,7 @@ export class AddonModAssignFeedbackCommentsHandlerService implements AddonModAss
     }
 
     /**
-     * Whether or not the handler is enabled on a site level.
-     *
-     * @returns True or promise resolved with true if enabled.
+     * @inheritdoc
      */
     async isEnabled(): Promise<boolean> {
         // In here we should check if comments is not disabled in site.
@@ -198,13 +166,7 @@ export class AddonModAssignFeedbackCommentsHandlerService implements AddonModAss
     }
 
     /**
-     * Prepare and add to pluginData the data to send to the server based on the draft data saved.
-     *
-     * @param assignId The assignment ID.
-     * @param userId User ID.
-     * @param plugin The plugin object.
-     * @param pluginData Object where to store the data to send.
-     * @param siteId Site ID. If not defined, current site.
+     * @inheritdoc
      */
     prepareFeedbackData(
         assignId: number,
@@ -225,13 +187,7 @@ export class AddonModAssignFeedbackCommentsHandlerService implements AddonModAss
     }
 
     /**
-     * Save draft data of the feedback plugin.
-     *
-     * @param assignId The assignment ID.
-     * @param userId User ID.
-     * @param plugin The plugin object.
-     * @param data The data to save.
-     * @param siteId Site ID. If not defined, current site.
+     * @inheritdoc
      */
     saveDraft(
         assignId: number,
diff --git a/src/addons/mod/assign/feedback/editpdf/services/handler.ts b/src/addons/mod/assign/feedback/editpdf/services/handler.ts
index 17d871a96..c40c2e36b 100644
--- a/src/addons/mod/assign/feedback/editpdf/services/handler.ts
+++ b/src/addons/mod/assign/feedback/editpdf/services/handler.ts
@@ -35,23 +35,14 @@ export class AddonModAssignFeedbackEditPdfHandlerService implements AddonModAssi
     type = 'editpdf';
 
     /**
-     * Return the Component to use to display the plugin data.
-     * It's recommended to return the class of the component, but you can also return an instance of the component.
-     *
-     * @returns The component (or promise resolved with component) to use, undefined if not found.
+     * @inheritdoc
      */
     getComponent(): Type<IAddonModAssignFeedbackPluginComponent> {
         return AddonModAssignFeedbackEditPdfComponent;
     }
 
     /**
-     * Get files used by this plugin.
-     * The files returned by this function will be prefetched when the user prefetches the assign.
-     *
-     * @param assign The assignment.
-     * @param submission The submission.
-     * @param plugin The plugin object.
-     * @returns The files (or promise resolved with the files).
+     * @inheritdoc
      */
     getPluginFiles(
         assign: AddonModAssignAssign,
@@ -62,9 +53,7 @@ export class AddonModAssignFeedbackEditPdfHandlerService implements AddonModAssi
     }
 
     /**
-     * Whether or not the handler is enabled on a site level.
-     *
-     * @returns True or promise resolved with true if enabled.
+     * @inheritdoc
      */
     async isEnabled(): Promise<boolean> {
         return true;
diff --git a/src/addons/mod/assign/feedback/file/services/handler.ts b/src/addons/mod/assign/feedback/file/services/handler.ts
index 3fac9b626..dad819815 100644
--- a/src/addons/mod/assign/feedback/file/services/handler.ts
+++ b/src/addons/mod/assign/feedback/file/services/handler.ts
@@ -35,23 +35,14 @@ export class AddonModAssignFeedbackFileHandlerService implements AddonModAssignF
     type = 'file';
 
     /**
-     * Return the Component to use to display the plugin data.
-     * It's recommended to return the class of the component, but you can also return an instance of the component.
-     *
-     * @returns The component (or promise resolved with component) to use, undefined if not found.
+     * @inheritdoc
      */
     getComponent(): Type<IAddonModAssignFeedbackPluginComponent> {
         return AddonModAssignFeedbackFileComponent;
     }
 
     /**
-     * Get files used by this plugin.
-     * The files returned by this function will be prefetched when the user prefetches the assign.
-     *
-     * @param assign The assignment.
-     * @param submission The submission.
-     * @param plugin The plugin object.
-     * @returns The files (or promise resolved with the files).
+     * @inheritdoc
      */
     getPluginFiles(
         assign: AddonModAssignAssign,
@@ -62,9 +53,7 @@ export class AddonModAssignFeedbackFileHandlerService implements AddonModAssignF
     }
 
     /**
-     * Whether or not the handler is enabled on a site level.
-     *
-     * @returns True or promise resolved with true if enabled.
+     * @inheritdoc
      */
     async isEnabled(): Promise<boolean> {
         return true;
diff --git a/src/addons/mod/assign/services/handlers/default-feedback.ts b/src/addons/mod/assign/services/handlers/default-feedback.ts
index 0de9e391a..d72d41ca0 100644
--- a/src/addons/mod/assign/services/handlers/default-feedback.ts
+++ b/src/addons/mod/assign/services/handlers/default-feedback.ts
@@ -15,8 +15,9 @@
 import { Injectable } from '@angular/core';
 import { CoreWSFile } from '@services/ws';
 import { Translate } from '@singletons';
-import { AddonModAssignPlugin } from '../assign';
+import { AddonModAssignAssign, AddonModAssignPlugin, AddonModAssignSavePluginData, AddonModAssignSubmission } from '../assign';
 import { AddonModAssignFeedbackHandler } from '../feedback-delegate';
+import { CoreFormFields } from '@singletons/form';
 
 /**
  * Default handler used when a feedback plugin doesn't have a specific implementation.
@@ -30,14 +31,19 @@ export class AddonModAssignDefaultFeedbackHandler implements AddonModAssignFeedb
     /**
      * @inheritdoc
      */
-    discardDraft(): void {
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    discardDraft(assignId: number, userId: number, siteId?: string): void | Promise<void> {
         // Nothing to do.
     }
 
     /**
      * @inheritdoc
      */
-    getDraft(): undefined {
+    getDraft(
+        assignId: number, // eslint-disable-line @typescript-eslint/no-unused-vars
+        userId: number, // eslint-disable-line @typescript-eslint/no-unused-vars
+        siteId?: string, // eslint-disable-line @typescript-eslint/no-unused-vars
+    ): CoreFormFields | Promise<CoreFormFields | undefined> | undefined {
         // Nothing to do.
         return;
     }
@@ -45,7 +51,12 @@ export class AddonModAssignDefaultFeedbackHandler implements AddonModAssignFeedb
     /**
      * @inheritdoc
      */
-    getPluginFiles(): CoreWSFile[] {
+    getPluginFiles(
+        assign: AddonModAssignAssign, // eslint-disable-line @typescript-eslint/no-unused-vars
+        submission: AddonModAssignSubmission, // eslint-disable-line @typescript-eslint/no-unused-vars
+        plugin: AddonModAssignPlugin, // eslint-disable-line @typescript-eslint/no-unused-vars
+        siteId?: string, // eslint-disable-line @typescript-eslint/no-unused-vars
+    ): CoreWSFile[] | Promise<CoreWSFile[]> {
         return [];
     }
 
@@ -73,14 +84,21 @@ export class AddonModAssignDefaultFeedbackHandler implements AddonModAssignFeedb
     /**
      * @inheritdoc
      */
-    hasDataChanged(): boolean {
+    async hasDataChanged(
+        assign: AddonModAssignAssign, // eslint-disable-line @typescript-eslint/no-unused-vars
+        submission: AddonModAssignSubmission, // eslint-disable-line @typescript-eslint/no-unused-vars
+        plugin: AddonModAssignPlugin, // eslint-disable-line @typescript-eslint/no-unused-vars
+        inputData: CoreFormFields, // eslint-disable-line @typescript-eslint/no-unused-vars
+        userId: number, // eslint-disable-line @typescript-eslint/no-unused-vars
+    ): Promise<boolean> {
         return false;
     }
 
     /**
      * @inheritdoc
      */
-    hasDraftData(): boolean {
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    hasDraftData(assignId: number, userId: number, siteId?: string): boolean | Promise<boolean> {
         return false;
     }
 
@@ -94,21 +112,38 @@ export class AddonModAssignDefaultFeedbackHandler implements AddonModAssignFeedb
     /**
      * @inheritdoc
      */
-    async prefetch(): Promise<void> {
+    async prefetch(
+        assign: AddonModAssignAssign, // eslint-disable-line @typescript-eslint/no-unused-vars
+        submission: AddonModAssignSubmission, // eslint-disable-line @typescript-eslint/no-unused-vars
+        plugin: AddonModAssignPlugin, // eslint-disable-line @typescript-eslint/no-unused-vars
+        siteId?: string, // eslint-disable-line @typescript-eslint/no-unused-vars
+    ): Promise<void> {
         return;
     }
 
     /**
      * @inheritdoc
      */
-    prepareFeedbackData(): void {
+    prepareFeedbackData(
+        assignId: number, // eslint-disable-line @typescript-eslint/no-unused-vars
+        userId: number, // eslint-disable-line @typescript-eslint/no-unused-vars
+        plugin: AddonModAssignPlugin, // eslint-disable-line @typescript-eslint/no-unused-vars
+        pluginData: AddonModAssignSavePluginData, // eslint-disable-line @typescript-eslint/no-unused-vars
+        siteId?: string, // eslint-disable-line @typescript-eslint/no-unused-vars
+    ): void | Promise<void> {
         // Nothing to do.
     }
 
     /**
      * @inheritdoc
      */
-    saveDraft(): void {
+    saveDraft(
+        assignId: number, // eslint-disable-line @typescript-eslint/no-unused-vars
+        userId: number, // eslint-disable-line @typescript-eslint/no-unused-vars
+        plugin: AddonModAssignPlugin, // eslint-disable-line @typescript-eslint/no-unused-vars
+        data: CoreFormFields, // eslint-disable-line @typescript-eslint/no-unused-vars
+        siteId?: string, // eslint-disable-line @typescript-eslint/no-unused-vars
+    ): void | Promise<void> {
         // Nothing to do.
     }
 
diff --git a/src/addons/mod/assign/services/handlers/default-submission.ts b/src/addons/mod/assign/services/handlers/default-submission.ts
index 3ab79c0b2..e78516b57 100644
--- a/src/addons/mod/assign/services/handlers/default-submission.ts
+++ b/src/addons/mod/assign/services/handlers/default-submission.ts
@@ -15,8 +15,10 @@
 import { Injectable } from '@angular/core';
 import { CoreWSFile } from '@services/ws';
 import { Translate } from '@singletons';
-import { AddonModAssignPlugin } from '../assign';
+import { AddonModAssignAssign, AddonModAssignPlugin, AddonModAssignSavePluginData, AddonModAssignSubmission } from '../assign';
 import { AddonModAssignSubmissionHandler } from '../submission-delegate';
+import { CoreFormFields } from '@singletons/form';
+import { AddonModAssignSubmissionsDBRecordFormatted } from '../assign-offline';
 
 /**
  * Default handler used when a submission plugin doesn't have a specific implementation.
@@ -30,42 +32,71 @@ export class AddonModAssignDefaultSubmissionHandler implements AddonModAssignSub
     /**
      * @inheritdoc
      */
-    canEditOffline(): boolean | Promise<boolean> {
+    canEditOffline(
+        assign: AddonModAssignAssign, // eslint-disable-line @typescript-eslint/no-unused-vars
+        submission: AddonModAssignSubmission, // eslint-disable-line @typescript-eslint/no-unused-vars
+        plugin: AddonModAssignPlugin, // eslint-disable-line @typescript-eslint/no-unused-vars
+    ): boolean | Promise<boolean> {
         return false;
     }
 
     /**
      * @inheritdoc
      */
-    isEmpty(): boolean {
+    isEmpty(
+        assign: AddonModAssignAssign, // eslint-disable-line @typescript-eslint/no-unused-vars
+        plugin: AddonModAssignPlugin, // eslint-disable-line @typescript-eslint/no-unused-vars
+    ): boolean {
         return true;
     }
 
     /**
      * @inheritdoc
      */
-    clearTmpData(): void {
+    clearTmpData(
+        assign: AddonModAssignAssign, // eslint-disable-line @typescript-eslint/no-unused-vars
+        submission: AddonModAssignSubmission, // eslint-disable-line @typescript-eslint/no-unused-vars
+        plugin: AddonModAssignPlugin, // eslint-disable-line @typescript-eslint/no-unused-vars
+        inputData: CoreFormFields, // eslint-disable-line @typescript-eslint/no-unused-vars
+    ): void {
         // Nothing to do.
     }
 
     /**
      * @inheritdoc
      */
-    copySubmissionData(): void {
+    copySubmissionData(
+        assign: AddonModAssignAssign, // eslint-disable-line @typescript-eslint/no-unused-vars
+        plugin: AddonModAssignPlugin, // eslint-disable-line @typescript-eslint/no-unused-vars
+        pluginData: AddonModAssignSavePluginData, // eslint-disable-line @typescript-eslint/no-unused-vars
+        userId?: number, // eslint-disable-line @typescript-eslint/no-unused-vars
+        siteId?: string, // eslint-disable-line @typescript-eslint/no-unused-vars
+    ): void | Promise<void> {
         // Nothing to do.
     }
 
     /**
      * @inheritdoc
      */
-    deleteOfflineData(): void {
+    deleteOfflineData(
+        assign: AddonModAssignAssign, // eslint-disable-line @typescript-eslint/no-unused-vars
+        submission: AddonModAssignSubmission, // eslint-disable-line @typescript-eslint/no-unused-vars
+        plugin: AddonModAssignPlugin, // eslint-disable-line @typescript-eslint/no-unused-vars
+        offlineData: AddonModAssignSubmissionsDBRecordFormatted, // eslint-disable-line @typescript-eslint/no-unused-vars
+        siteId?: string, // eslint-disable-line @typescript-eslint/no-unused-vars
+    ): void | Promise<void> {
         // Nothing to do.
     }
 
     /**
      * @inheritdoc
      */
-    getPluginFiles(): CoreWSFile[] {
+    getPluginFiles(
+        assign: AddonModAssignAssign, // eslint-disable-line @typescript-eslint/no-unused-vars
+        submission: AddonModAssignSubmission, // eslint-disable-line @typescript-eslint/no-unused-vars
+        plugin: AddonModAssignPlugin, // eslint-disable-line @typescript-eslint/no-unused-vars
+        siteId?: string, // eslint-disable-line @typescript-eslint/no-unused-vars
+        ): CoreWSFile[] | Promise<CoreWSFile[]> {
         return [];
     }
 
@@ -93,21 +124,34 @@ export class AddonModAssignDefaultSubmissionHandler implements AddonModAssignSub
     /**
      * @inheritdoc
      */
-    getSizeForCopy(): number {
+    getSizeForCopy(
+        assign: AddonModAssignAssign, // eslint-disable-line @typescript-eslint/no-unused-vars
+        plugin: AddonModAssignPlugin, // eslint-disable-line @typescript-eslint/no-unused-vars
+    ): number | Promise<number> {
         return 0;
     }
 
     /**
      * @inheritdoc
      */
-    getSizeForEdit(): number {
+    getSizeForEdit(
+        assign: AddonModAssignAssign, // eslint-disable-line @typescript-eslint/no-unused-vars
+        submission: AddonModAssignSubmission, // eslint-disable-line @typescript-eslint/no-unused-vars
+        plugin: AddonModAssignPlugin, // eslint-disable-line @typescript-eslint/no-unused-vars
+        inputData: CoreFormFields, // eslint-disable-line @typescript-eslint/no-unused-vars
+    ): number | Promise<number> {
         return 0;
     }
 
     /**
      * @inheritdoc
      */
-    hasDataChanged(): boolean {
+    async hasDataChanged(
+        assign: AddonModAssignAssign, // eslint-disable-line @typescript-eslint/no-unused-vars
+        submission: AddonModAssignSubmission, // eslint-disable-line @typescript-eslint/no-unused-vars
+        plugin: AddonModAssignPlugin, // eslint-disable-line @typescript-eslint/no-unused-vars
+        inputData: CoreFormFields, // eslint-disable-line @typescript-eslint/no-unused-vars
+    ): Promise<boolean> {
         return false;
     }
 
@@ -121,28 +165,49 @@ export class AddonModAssignDefaultSubmissionHandler implements AddonModAssignSub
     /**
      * @inheritdoc
      */
-    isEnabledForEdit(): boolean {
+    isEnabledForEdit(): boolean | Promise<boolean> {
         return false;
     }
 
     /**
      * @inheritdoc
      */
-    async prefetch(): Promise<void> {
+    async prefetch(
+        assign: AddonModAssignAssign, // eslint-disable-line @typescript-eslint/no-unused-vars
+        submission: AddonModAssignSubmission, // eslint-disable-line @typescript-eslint/no-unused-vars
+        plugin: AddonModAssignPlugin, // eslint-disable-line @typescript-eslint/no-unused-vars
+        siteId?: string, // eslint-disable-line @typescript-eslint/no-unused-vars
+    ): Promise<void> {
         return;
     }
 
     /**
      * @inheritdoc
      */
-    prepareSubmissionData(): void {
+    prepareSubmissionData(
+        assign: AddonModAssignAssign, // eslint-disable-line @typescript-eslint/no-unused-vars
+        submission: AddonModAssignSubmission, // eslint-disable-line @typescript-eslint/no-unused-vars
+        plugin: AddonModAssignPlugin, // eslint-disable-line @typescript-eslint/no-unused-vars
+        inputData: CoreFormFields, // eslint-disable-line @typescript-eslint/no-unused-vars
+        pluginData: AddonModAssignSavePluginData, // eslint-disable-line @typescript-eslint/no-unused-vars
+        offline?: boolean, // eslint-disable-line @typescript-eslint/no-unused-vars
+        userId?: number, // eslint-disable-line @typescript-eslint/no-unused-vars
+        siteId?: string, // eslint-disable-line @typescript-eslint/no-unused-vars
+    ): void | Promise<void> {
         // Nothing to do.
     }
 
     /**
      * @inheritdoc
      */
-    prepareSyncData(): void {
+    prepareSyncData(
+        assign: AddonModAssignAssign, // eslint-disable-line @typescript-eslint/no-unused-vars
+        submission: AddonModAssignSubmission, // eslint-disable-line @typescript-eslint/no-unused-vars
+        plugin: AddonModAssignPlugin, // eslint-disable-line @typescript-eslint/no-unused-vars
+        offlineData: AddonModAssignSubmissionsDBRecordFormatted, // eslint-disable-line @typescript-eslint/no-unused-vars
+        pluginData: AddonModAssignSavePluginData, // eslint-disable-line @typescript-eslint/no-unused-vars
+        siteId?: string, // eslint-disable-line @typescript-eslint/no-unused-vars
+    ): void | Promise<void> {
         // Nothing to do.
     }
 
diff --git a/src/addons/mod/assign/services/submission-delegate.ts b/src/addons/mod/assign/services/submission-delegate.ts
index 5aaf1a76a..5f4d39e7e 100644
--- a/src/addons/mod/assign/services/submission-delegate.ts
+++ b/src/addons/mod/assign/services/submission-delegate.ts
@@ -194,7 +194,7 @@ export interface AddonModAssignSubmissionHandler extends CoreDelegateHandler {
         submission: AddonModAssignSubmission,
         plugin: AddonModAssignPlugin,
         inputData: CoreFormFields,
-    ): boolean | Promise<boolean>;
+    ): Promise<boolean>;
 
     /**
      * Whether or not the handler is enabled for edit on a site level.
diff --git a/src/addons/mod/assign/submission/comments/services/handler.ts b/src/addons/mod/assign/submission/comments/services/handler.ts
index e2f05162d..3bb5a0162 100644
--- a/src/addons/mod/assign/submission/comments/services/handler.ts
+++ b/src/addons/mod/assign/submission/comments/services/handler.ts
@@ -30,11 +30,7 @@ export class AddonModAssignSubmissionCommentsHandlerService implements AddonModA
     type = 'comments';
 
     /**
-     * Whether the plugin can be edited in offline for existing submissions. In general, this should return false if the
-     * plugin uses Moodle filters. The reason is that the app only prefetches filtered data, and the user should edit
-     * unfiltered data.
-     *
-     * @returns Boolean or promise resolved with boolean: whether it can be edited in offline.
+     * @inheritdoc
      */
     canEditOffline(): boolean {
         // This plugin is read only, but return true to prevent blocking the edition.
@@ -42,44 +38,28 @@ export class AddonModAssignSubmissionCommentsHandlerService implements AddonModA
     }
 
     /**
-     * Return the Component to use to display the plugin data, either in read or in edit mode.
-     * It's recommended to return the class of the component, but you can also return an instance of the component.
-     *
-     * @param plugin The plugin object.
-     * @param edit Whether the user is editing.
-     * @returns The component (or promise resolved with component) to use, undefined if not found.
+     * @inheritdoc
      */
     getComponent(plugin: AddonModAssignPlugin, edit = false): Type<AddonModAssignSubmissionPluginBaseComponent> | undefined {
         return edit ? undefined : AddonModAssignSubmissionCommentsComponent;
     }
 
     /**
-     * Whether or not the handler is enabled on a site level.
-     *
-     * @returns True or promise resolved with true if enabled.
+     * @inheritdoc
      */
     async isEnabled(): Promise<boolean> {
         return true;
     }
 
     /**
-     * Whether or not the handler is enabled for edit on a site level.
-     *
-     * @returns Whether or not the handler is enabled for edit on a site level.
+     * @inheritdoc
      */
     isEnabledForEdit(): boolean{
         return true;
     }
 
     /**
-     * Prefetch any required data for the plugin.
-     * This should NOT prefetch files. Files to be prefetched should be returned by the getPluginFiles function.
-     *
-     * @param assign The assignment.
-     * @param submission The submission.
-     * @param plugin The plugin object.
-     * @param siteId Site ID. If not defined, current site.
-     * @returns Promise resolved when done.
+     * @inheritdoc
      */
     async prefetch(
         assign: AddonModAssignAssign,
diff --git a/src/addons/mod/assign/submission/file/services/handler.ts b/src/addons/mod/assign/submission/file/services/handler.ts
index a919b5ac4..121f64fb5 100644
--- a/src/addons/mod/assign/submission/file/services/handler.ts
+++ b/src/addons/mod/assign/submission/file/services/handler.ts
@@ -45,11 +45,7 @@ export class AddonModAssignSubmissionFileHandlerService implements AddonModAssig
     type = 'file';
 
     /**
-     * Whether the plugin can be edited in offline for existing submissions. In general, this should return false if the
-     * plugin uses Moodle filters. The reason is that the app only prefetches filtered data, and the user should edit
-     * unfiltered data.
-     *
-     * @returns Boolean or promise resolved with boolean: whether it can be edited in offline.
+     * @inheritdoc
      */
     canEditOffline(): boolean {
         // This plugin doesn't use Moodle filters, it can be edited in offline.
@@ -57,11 +53,7 @@ export class AddonModAssignSubmissionFileHandlerService implements AddonModAssig
     }
 
     /**
-     * Check if a plugin has no data.
-     *
-     * @param assign The assignment.
-     * @param plugin The plugin object.
-     * @returns Whether the plugin is empty.
+     * @inheritdoc
      */
     isEmpty(assign: AddonModAssignAssign, plugin: AddonModAssignPlugin): boolean {
         const files = AddonModAssign.getSubmissionPluginAttachments(plugin);
@@ -70,9 +62,7 @@ export class AddonModAssignSubmissionFileHandlerService implements AddonModAssig
     }
 
     /**
-     * Should clear temporary data for a cancelled submission.
-     *
-     * @param assign The assignment.
+     * @inheritdoc
      */
     clearTmpData(assign: AddonModAssignAssign): void {
         const files = CoreFileSession.getFiles(AddonModAssignProvider.COMPONENT, assign.id);
@@ -85,13 +75,7 @@ export class AddonModAssignSubmissionFileHandlerService implements AddonModAssig
     }
 
     /**
-     * This function will be called when the user wants to create a new submission based on the previous one.
-     * It should add to pluginData the data to send to server based in the data in plugin (previous attempt).
-     *
-     * @param assign The assignment.
-     * @param plugin The plugin object.
-     * @param pluginData Object where to store the data to send.
-     * @returns If the function is async, it should return a Promise resolved when done.
+     * @inheritdoc
      */
     async copySubmissionData(
         assign: AddonModAssignAssign,
@@ -106,24 +90,14 @@ export class AddonModAssignSubmissionFileHandlerService implements AddonModAssig
     }
 
     /**
-     * Return the Component to use to display the plugin data, either in read or in edit mode.
-     * It's recommended to return the class of the component, but you can also return an instance of the component.
-     *
-     * @returns The component (or promise resolved with component) to use, undefined if not found.
+     * @inheritdoc
      */
     getComponent(): Type<AddonModAssignSubmissionPluginBaseComponent> {
         return AddonModAssignSubmissionFileComponent;
     }
 
     /**
-     * Delete any stored data for the plugin and submission.
-     *
-     * @param assign The assignment.
-     * @param submission The submission.
-     * @param plugin The plugin object.
-     * @param offlineData Offline data stored.
-     * @param siteId Site ID. If not defined, current site.
-     * @returns If the function is async, it should return a Promise resolved when done.
+     * @inheritdoc
      */
     async deleteOfflineData(
         assign: AddonModAssignAssign,
@@ -144,13 +118,7 @@ export class AddonModAssignSubmissionFileHandlerService implements AddonModAssig
     }
 
     /**
-     * Get files used by this plugin.
-     * The files returned by this function will be prefetched when the user prefetches the assign.
-     *
-     * @param assign The assignment.
-     * @param submission The submission.
-     * @param plugin The plugin object.
-     * @returns The files (or promise resolved with the files).
+     * @inheritdoc
      */
     getPluginFiles(
         assign: AddonModAssignAssign,
@@ -161,11 +129,7 @@ export class AddonModAssignSubmissionFileHandlerService implements AddonModAssig
     }
 
     /**
-     * Get the size of data (in bytes) this plugin will send to copy a previous submission.
-     *
-     * @param assign The assignment.
-     * @param plugin The plugin object.
-     * @returns The size (or promise resolved with size).
+     * @inheritdoc
      */
     async getSizeForCopy(assign: AddonModAssignAssign, plugin: AddonModAssignPlugin): Promise<number> {
         const files = AddonModAssign.getSubmissionPluginAttachments(plugin);
@@ -174,12 +138,7 @@ export class AddonModAssignSubmissionFileHandlerService implements AddonModAssig
     }
 
     /**
-     * Get the size of data (in bytes) this plugin will send to add or edit a submission.
-     *
-     * @param assign The assignment.
-     * @param submission The submission.
-     * @param plugin The plugin object.
-     * @returns The size (or promise resolved with size).
+     * @inheritdoc
      */
     async getSizeForEdit(
         assign: AddonModAssignAssign,
@@ -199,12 +158,7 @@ export class AddonModAssignSubmissionFileHandlerService implements AddonModAssig
     }
 
     /**
-     * Check if the submission data has changed for this plugin.
-     *
-     * @param assign The assignment.
-     * @param submission The submission.
-     * @param plugin The plugin object.
-     * @returns Boolean (or promise resolved with boolean): whether the data has changed.
+     * @inheritdoc
      */
     async hasDataChanged(
         assign: AddonModAssignAssign,
@@ -243,35 +197,21 @@ export class AddonModAssignSubmissionFileHandlerService implements AddonModAssig
     }
 
     /**
-     * Whether or not the handler is enabled on a site level.
-     *
-     * @returns True or promise resolved with true if enabled.
+     * @inheritdoc
      */
     async isEnabled(): Promise<boolean> {
         return true;
     }
 
     /**
-     * Whether or not the handler is enabled for edit on a site level.
-     *
-     * @returns Whether or not the handler is enabled for edit on a site level.
+     * @inheritdoc
      */
     isEnabledForEdit(): boolean {
         return true;
     }
 
     /**
-     * Prepare and add to pluginData the data to send to the server based on the input data.
-     *
-     * @param assign The assignment.
-     * @param submission The submission.
-     * @param plugin The plugin object.
-     * @param inputData Data entered by the user for the submission.
-     * @param pluginData Object where to store the data to send.
-     * @param offline Whether the user is editing in offline.
-     * @param userId User ID. If not defined, site's current user.
-     * @param siteId Site ID. If not defined, current site.
-     * @returns If the function is async, it should return a Promise resolved when done.
+     * @inheritdoc
      */
     async prepareSubmissionData(
         assign: AddonModAssignAssign,
@@ -308,16 +248,7 @@ export class AddonModAssignSubmissionFileHandlerService implements AddonModAssig
     }
 
     /**
-     * Prepare and add to pluginData the data to send to the server based on the offline data stored.
-     * This will be used when performing a synchronization.
-     *
-     * @param assign The assignment.
-     * @param submission The submission.
-     * @param plugin The plugin object.
-     * @param offlineData Offline data stored.
-     * @param pluginData Object where to store the data to send.
-     * @param siteId Site ID. If not defined, current site.
-     * @returns If the function is async, it should return a Promise resolved when done.
+     * @inheritdoc
      */
     async prepareSyncData(
         assign: AddonModAssignAssign,
diff --git a/src/addons/mod/assign/submission/onlinetext/services/handler.ts b/src/addons/mod/assign/submission/onlinetext/services/handler.ts
index e0f0a93a5..8ae7b7f78 100644
--- a/src/addons/mod/assign/submission/onlinetext/services/handler.ts
+++ b/src/addons/mod/assign/submission/onlinetext/services/handler.ts
@@ -41,11 +41,7 @@ export class AddonModAssignSubmissionOnlineTextHandlerService implements AddonMo
     type = 'onlinetext';
 
     /**
-     * Whether the plugin can be edited in offline for existing submissions. In general, this should return false if the
-     * plugin uses Moodle filters. The reason is that the app only prefetches filtered data, and the user should edit
-     * unfiltered data.
-     *
-     * @returns Boolean or promise resolved with boolean: whether it can be edited in offline.
+     * @inheritdoc
      */
     canEditOffline(): boolean {
         // This plugin uses Moodle filters, it cannot be edited in offline.
@@ -53,11 +49,7 @@ export class AddonModAssignSubmissionOnlineTextHandlerService implements AddonMo
     }
 
     /**
-     * Check if a plugin has no data.
-     *
-     * @param assign The assignment.
-     * @param plugin The plugin object.
-     * @returns Whether the plugin is empty.
+     * @inheritdoc
      */
     isEmpty(assign: AddonModAssignAssign, plugin: AddonModAssignPlugin): boolean {
         const text = AddonModAssign.getSubmissionPluginText(plugin, true);
@@ -67,15 +59,7 @@ export class AddonModAssignSubmissionOnlineTextHandlerService implements AddonMo
     }
 
     /**
-     * This function will be called when the user wants to create a new submission based on the previous one.
-     * It should add to pluginData the data to send to server based in the data in plugin (previous attempt).
-     *
-     * @param assign The assignment.
-     * @param plugin The plugin object.
-     * @param pluginData Object where to store the data to send.
-     * @param userId User ID. If not defined, site's current user.
-     * @param siteId Site ID. If not defined, current site.
-     * @returns If the function is async, it should return a Promise resolved when done.
+     * @inheritdoc
      */
     async copySubmissionData(
         assign: AddonModAssignAssign,
@@ -102,23 +86,14 @@ export class AddonModAssignSubmissionOnlineTextHandlerService implements AddonMo
     }
 
     /**
-     * Return the Component to use to display the plugin data, either in read or in edit mode.
-     * It's recommended to return the class of the component, but you can also return an instance of the component.
-     *
-     * @returns The component (or promise resolved with component) to use, undefined if not found.
+     * @inheritdoc
      */
     getComponent(): Type<AddonModAssignSubmissionPluginBaseComponent> {
         return AddonModAssignSubmissionOnlineTextComponent;
     }
 
     /**
-     * Get files used by this plugin.
-     * The files returned by this function will be prefetched when the user prefetches the assign.
-     *
-     * @param assign The assignment.
-     * @param submission The submission.
-     * @param plugin The plugin object.
-     * @returns The files (or promise resolved with the files).
+     * @inheritdoc
      */
     getPluginFiles(
         assign: AddonModAssignAssign,
@@ -129,11 +104,7 @@ export class AddonModAssignSubmissionOnlineTextHandlerService implements AddonMo
     }
 
     /**
-     * Get the size of data (in bytes) this plugin will send to copy a previous submission.
-     *
-     * @param assign The assignment.
-     * @param plugin The plugin object.
-     * @returns The size (or promise resolved with size).
+     * @inheritdoc
      */
     async getSizeForCopy(assign: AddonModAssignAssign, plugin: AddonModAssignPlugin): Promise<number> {
         const text = AddonModAssign.getSubmissionPluginText(plugin, true);
@@ -145,12 +116,7 @@ export class AddonModAssignSubmissionOnlineTextHandlerService implements AddonMo
     }
 
     /**
-     * Get the size of data (in bytes) this plugin will send to add or edit a submission.
-     *
-     * @param assign The assignment.
-     * @param submission The submission.
-     * @param plugin The plugin object.
-     * @returns The size (or promise resolved with size).
+     * @inheritdoc
      */
     getSizeForEdit(
         assign: AddonModAssignAssign,
@@ -177,13 +143,7 @@ export class AddonModAssignSubmissionOnlineTextHandlerService implements AddonMo
     }
 
     /**
-     * Check if the submission data has changed for this plugin.
-     *
-     * @param assign The assignment.
-     * @param submission The submission.
-     * @param plugin The plugin object.
-     * @param inputData Data entered by the user for the submission.
-     * @returns Boolean (or promise resolved with boolean): whether the data has changed.
+     * @inheritdoc
      */
     async hasDataChanged(
         assign: AddonModAssignAssign,
@@ -209,31 +169,21 @@ export class AddonModAssignSubmissionOnlineTextHandlerService implements AddonMo
     }
 
     /**
-     * Whether or not the handler is enabled on a site level.
-     *
-     * @returns True or promise resolved with true if enabled.
+     * @inheritdoc
      */
     async isEnabled(): Promise<boolean> {
         return true;
     }
 
     /**
-     * Whether or not the handler is enabled for edit on a site level.
-     *
-     * @returns Whether or not the handler is enabled for edit on a site level.
+     * @inheritdoc
      */
     isEnabledForEdit(): boolean {
         return true;
     }
 
     /**
-     * Prepare and add to pluginData the data to send to the server based on the input data.
-     *
-     * @param assign The assignment.
-     * @param submission The submission.
-     * @param plugin The plugin object.
-     * @param inputData Data entered by the user for the submission.
-     * @param pluginData Object where to store the data to send.
+     * @inheritdoc
      */
     prepareSubmissionData(
         assign: AddonModAssignAssign,
@@ -269,14 +219,7 @@ export class AddonModAssignSubmissionOnlineTextHandlerService implements AddonMo
     }
 
     /**
-     * Prepare and add to pluginData the data to send to the server based on the offline data stored.
-     * This will be used when performing a synchronization.
-     *
-     * @param assign The assignment.
-     * @param submission The submission.
-     * @param plugin The plugin object.
-     * @param offlineData Offline data stored.
-     * @param pluginData Object where to store the data to send.
+     * @inheritdoc
      */
     prepareSyncData(
         assign: AddonModAssignAssign,