diff --git a/src/core/sharedfiles/sharedfiles.module.ts b/src/core/sharedfiles/sharedfiles.module.ts
index c31accbad..185a9a5bf 100644
--- a/src/core/sharedfiles/sharedfiles.module.ts
+++ b/src/core/sharedfiles/sharedfiles.module.ts
@@ -49,31 +49,33 @@ export class CoreSharedFilesModule {
         // Register the handler.
         delegate.registerHandler(handler);
 
-        if (appsProvider.isIOS()) {
-            let lastCheck = 0;
+        platform.ready().then(() => {
+            if (appsProvider.isIOS()) {
+                let lastCheck = 0;
 
-            // Check if there are new files at app start and when the app is resumed.
-            helper.searchIOSNewSharedFiles();
-            platform.resume.subscribe(() => {
-                // Wait a bit to make sure that APP_LAUNCHED_URL is treated before this callback.
-                setTimeout(() => {
-                    if (Date.now() - lastCheck < 1000) {
-                        // Last check less than 1s ago, don't do anything.
-                        return;
+                // Check if there are new files at app start and when the app is resumed.
+                helper.searchIOSNewSharedFiles();
+                platform.resume.subscribe(() => {
+                    // Wait a bit to make sure that APP_LAUNCHED_URL is treated before this callback.
+                    setTimeout(() => {
+                        if (Date.now() - lastCheck < 1000) {
+                            // Last check less than 1s ago, don't do anything.
+                            return;
+                        }
+
+                        lastCheck = Date.now();
+                        helper.searchIOSNewSharedFiles();
+                    }, 200);
+                });
+
+                eventsProvider.on(CoreEventsProvider.APP_LAUNCHED_URL, (url) => {
+                    if (url && url.indexOf('file://') === 0) {
+                        // We received a file in iOS, it's probably a shared file. Treat it.
+                        lastCheck = Date.now();
+                        helper.searchIOSNewSharedFiles(url);
                     }
-
-                    lastCheck = Date.now();
-                    helper.searchIOSNewSharedFiles();
-                }, 200);
-            });
-
-            eventsProvider.on(CoreEventsProvider.APP_LAUNCHED_URL, (url) => {
-                if (url && url.indexOf('file://') === 0) {
-                    // We received a file in iOS, it's probably a shared file. Treat it.
-                    lastCheck = Date.now();
-                    helper.searchIOSNewSharedFiles(url);
-                }
-            });
-        }
+                });
+            }
+        });
     }
 }
diff --git a/src/providers/app.ts b/src/providers/app.ts
index 8ad693772..02c1279ae 100644
--- a/src/providers/app.ts
+++ b/src/providers/app.ts
@@ -392,7 +392,8 @@ export class CoreAppProvider {
      * @return Whether the app is running in an Android mobile or tablet device.
      */
     isAndroid(): boolean {
-        return this.isMobile() && this.device.platform.toLowerCase() == 'android';
+        return this.isMobile() &&
+            ((this.device.platform && this.device.platform.toLowerCase() == 'android') || this.platform.is('android'));
     }
 
     /**
@@ -412,7 +413,8 @@ export class CoreAppProvider {
      * @return Whether the app is running in an iOS mobile or tablet device.
      */
     isIOS(): boolean {
-        return this.isMobile() && this.device.platform.toLowerCase() == 'ios';
+        return this.isMobile() &&
+            ((this.device.platform && this.device.platform.toLowerCase() == 'ios') || this.platform.is('ios'));
     }
 
     /**
diff --git a/src/providers/file.ts b/src/providers/file.ts
index 98df61923..d0a86cc78 100644
--- a/src/providers/file.ts
+++ b/src/providers/file.ts
@@ -81,28 +81,31 @@ export class CoreFileProvider {
 
         this.logger = logger.getInstance('CoreFileProvider');
 
-        if (appProvider.isAndroid() && !Object.getOwnPropertyDescriptor(FileReader.prototype, 'onloadend')) {
-            // Cordova File plugin creates some getters and setter for FileReader, but Ionic's polyfills override them in Android.
-            // Create the getters and setters again. This code comes from FileReader.js in cordova-plugin-file.
-            this.defineGetterSetter(FileReader.prototype, 'readyState', function(): any {
-                return this._localURL ? this._readyState : this._realReader.readyState;
-            });
+        platform.ready().then(() => {
+            if (appProvider.isAndroid() && !Object.getOwnPropertyDescriptor(FileReader.prototype, 'onloadend')) {
+                // Cordova File plugin creates some getters and setter for FileReader, but
+                // Ionic's polyfills override them in Android.
+                // Create the getters and setters again. This code comes from FileReader.js in cordova-plugin-file.
+                this.defineGetterSetter(FileReader.prototype, 'readyState', function(): any {
+                    return this._localURL ? this._readyState : this._realReader.readyState;
+                });
 
-            this.defineGetterSetter(FileReader.prototype, 'error', function(): any {
-                return this._localURL ? this._error : this._realReader.error;
-            });
+                this.defineGetterSetter(FileReader.prototype, 'error', function(): any {
+                    return this._localURL ? this._error : this._realReader.error;
+                });
 
-            this.defineGetterSetter(FileReader.prototype, 'result', function(): any {
-                return this._localURL ? this._result : this._realReader.result;
-            });
+                this.defineGetterSetter(FileReader.prototype, 'result', function(): any {
+                    return this._localURL ? this._result : this._realReader.result;
+                });
 
-            this.defineEvent('onloadstart');
-            this.defineEvent('onprogress');
-            this.defineEvent('onload');
-            this.defineEvent('onerror');
-            this.defineEvent('onloadend');
-            this.defineEvent('onabort');
-        }
+                this.defineEvent('onloadstart');
+                this.defineEvent('onprogress');
+                this.defineEvent('onload');
+                this.defineEvent('onerror');
+                this.defineEvent('onloadend');
+                this.defineEvent('onabort');
+            }
+        });
     }
 
     /**
diff --git a/src/providers/utils/iframe.ts b/src/providers/utils/iframe.ts
index 7eb0edf2f..efcbda6b7 100644
--- a/src/providers/utils/iframe.ts
+++ b/src/providers/utils/iframe.ts
@@ -16,7 +16,7 @@ import { Injectable, NgZone } from '@angular/core';
 import { Config, Platform, NavController } from 'ionic-angular';
 import { TranslateService } from '@ngx-translate/core';
 import { Network } from '@ionic-native/network';
-import { CoreApp } from '../app';
+import { CoreApp, CoreAppProvider } from '../app';
 import { CoreFileProvider } from '../file';
 import { CoreLoggerProvider } from '../logger';
 import { CoreSitesProvider } from '../sites';
@@ -47,6 +47,7 @@ export class CoreIframeUtilsProvider {
             private utils: CoreUtilsProvider,
             private domUtils: CoreDomUtilsProvider,
             platform: Platform,
+            appProvider: CoreAppProvider,
             private translate: TranslateService,
             private network: Network, private zone: NgZone,
             private config: Config,
@@ -56,8 +57,8 @@ export class CoreIframeUtilsProvider {
 
         const win = <WKUserScriptWindow> window;
 
-        if (CoreApp.instance.isIOS() && win.WKUserScript) {
-            platform.ready().then(() => {
+        platform.ready().then(() => {
+            if (appProvider.isIOS() && win.WKUserScript) {
                 // Inject code to the iframes because we cannot access the online ones.
                 const wwwPath = fileProvider.getWWWAbsolutePath();
                 const linksPath = textUtils.concatenatePaths(wwwPath, 'assets/js/iframe-treat-links.js');
@@ -72,8 +73,8 @@ export class CoreIframeUtilsProvider {
 
                 // Handle post messages received by iframes.
                 window.addEventListener('message', this.handleIframeMessage.bind(this));
-            });
-        }
+            }
+        });
     }
 
     /**