bower install Install the app in an Android and iOS device and check that filesystem is not broken. You can add an alert to $mmEmulatorManager#loadHTMLAPI to verify that the HTML API isn't being loaded in real devices. Start Chrome/Chromium with the flag --allow-file-access-from-files. Check that you can download files in browser. Open a downloaded resource (page, imscp, ...) and check that the URL used uses filesystem: protocol. You can also check that you can open it in offline. NOTE: For some reasons PDFs can't be seen using the browser PDF viewer. I manually downloaded them and I could open them by using a native viewer, maybe it's something related to the encoding.