What is the issue with app permissions on Android 11 and later?

Starting with Android 11, the phone can automatically remove permissions assigned to the app, if it hasn’t been actively used for a while. This can happen even if the app is set to automatically create scheduled backups. To make sure that the permissions are not removed for the app, it now shows a note on the main screen of the app with a button where you can turn off this setting for the app.

More info about this permission revocation in Android is available here.