We're building our own ROM from AOSP, and the ROM will have a third-party app installed to /system/priv-app but we need to give that app read and write access to the main external storage without any user input.
The ROM is based on Android 11, API level 30.
However, we found no such permissions that could allow us to grant the app external storage access, and it seems like whatever permissions like WRITE_EXTERNAL_STORAGE, READ_EXTERNAL_STORAGE, etc. either have no effect or doesn't function as expected in Android 11.
We found MANAGE_EXTERNAL_STORAGE, but this also needs user input via ACTION_MANAGE_ALL_FILES_ACCESS_PERMISSION intent.
Are there any hidden permissions to allow us such thing? Or is there any other solution that can achieve the same effect?
