Here's another approach, using the FilePicker, which is simpler and works on all Android versions. You can pick any file, copy it to /Documents, and then have full access to it. On Android 11+, no permissions are required (requested). For text files, images, and PDF files, the content is displayed immediately. Otherwise, the extension (mp4, mp3, ...) is displayed.
In this way, permissions can be completely avoided, especially those that have been banned on Android 13+ since May 2025, such as READ_MEDIA_IMAGES and READ_MEDIA_VIDEO.