diff --git a/src/addons/remotethemes/services/remotethemes-handler.ts b/src/addons/remotethemes/services/remotethemes-handler.ts
index 5cde27432..d04eb9cd3 100644
--- a/src/addons/remotethemes/services/remotethemes-handler.ts
+++ b/src/addons/remotethemes/services/remotethemes-handler.ts
@@ -90,7 +90,7 @@ export class AddonRemoteThemesHandlerService implements CoreStyleHandler {
         if (style != '') {
             // Treat the CSS.
             CoreUtils.ignoreErrors(
-                CoreFilepool.treatCSSCode(siteId, fileUrl, style, COMPONENT, 2),
+                CoreFilepool.treatCSSCode(siteId, fileUrl, style, COMPONENT, 1),
             );
         }
 
diff --git a/src/core/directives/external-content.ts b/src/core/directives/external-content.ts
index 17635acd3..9d3afa58d 100644
--- a/src/core/directives/external-content.ts
+++ b/src/core/directives/external-content.ts
@@ -271,7 +271,7 @@ export class CoreExternalContentDirective implements AfterViewInit, OnChanges, O
         urls = CoreUtils.uniqueArray(urls); // Remove duplicates.
 
         const promises = urls.map(async (url) => {
-            const finalUrl = await CoreFilepool.getUrlByUrl(siteId, url, this.component, this.componentId, 0, true, true);
+            const finalUrl = await CoreFilepool.getSrcByUrl(siteId, url, this.component, this.componentId, 0, true, true);
 
             this.logger.debug('Using URL ' + finalUrl + ' for ' + url + ' in inline styles');
             inlineStyles = inlineStyles.replace(new RegExp(url, 'gi'), finalUrl);
diff --git a/src/core/features/siteplugins/services/siteplugins-helper.ts b/src/core/features/siteplugins/services/siteplugins-helper.ts
index 1c715bb6d..5de98ba3a 100644
--- a/src/core/features/siteplugins/services/siteplugins-helper.ts
+++ b/src/core/features/siteplugins/services/siteplugins-helper.ts
@@ -195,6 +195,11 @@ export class CoreSitePluginsHelperProvider {
             return '';
         }
 
+        // Update the schema with the final CSS URL.
+        if (handlerSchema.styles) {
+            handlerSchema.styles.url = url;
+        }
+
         // Download the file if not downloaded or the version changed.
         const path = await CoreFilepool.downloadUrl(
             site.getId(),
diff --git a/src/core/services/filepool.ts b/src/core/services/filepool.ts
index b3db06a44..55675f65f 100644
--- a/src/core/services/filepool.ts
+++ b/src/core/services/filepool.ts
@@ -2948,7 +2948,7 @@ export class CoreFilepoolProvider {
      * and store the result in the CSS file.
      *
      * @param siteId Site ID.
-     * @param fileUrl CSS file URL.
+     * @param fileUrl CSS file URL. If a local path is supplied the app will assume it's the path where to write the file.
      * @param cssCode CSS code.
      * @param component The component to link the file to.
      * @param componentId An ID to use in conjunction with the component.
@@ -2966,29 +2966,33 @@ export class CoreFilepoolProvider {
         const urls = CoreDomUtils.extractUrlsFromCSS(cssCode);
         let updated = false;
 
-        // Get the path of the CSS file.
-        const filePath = await this.getFilePathByUrl(siteId, fileUrl);
+        // Get the path of the CSS file. If it's a local file, assume it's the path where to write the file.
+        const filePath = CoreUrlUtils.isLocalFileUrl(fileUrl) ?
+            fileUrl :
+            await this.getFilePathByUrl(siteId, fileUrl);
 
         // Download all files in the CSS.
         await Promise.all(urls.map(async (url) => {
-            // Download the file only if it's an online URL.
-            if (CoreUrlUtils.isLocalFileUrl(url)) {
-                return;
-            }
-
             try {
-                const fileUrl = await this.downloadUrl(
-                    siteId,
-                    url,
-                    false,
-                    component,
-                    componentId,
-                    0,
-                    undefined,
-                    undefined,
-                    undefined,
-                    revision,
-                );
+                let fileUrl = url;
+                if (!CoreUrlUtils.isLocalFileUrl(url)) {
+                    // Not a local file, download it.
+                    fileUrl = await this.downloadUrl(
+                        siteId,
+                        url,
+                        false,
+                        component,
+                        componentId,
+                        0,
+                        undefined,
+                        undefined,
+                        undefined,
+                        revision,
+                    );
+                }
+
+                // Convert the URL so it works in mobile devices.
+                fileUrl = CoreFile.convertFileSrc(fileUrl);
 
                 if (fileUrl != url) {
                     cssCode = cssCode.replace(new RegExp(CoreTextUtils.escapeForRegex(url), 'g'), fileUrl);