Music Folders Selection doesn't work on Android 10

On Android 10 system dialog is used when ENABLE or CHANGE button is pressed for folders selection and permissions.
That system dialog can be previously disabled by user or can be missing from some ROMs completely.

Please ensure, that following system app exists and is not disabled on your device (you may need to select some option to show all apps / system apps):

  • Files (com.google.android.documentsui)
    files-eng.png.4509a80acf232ecfeb6161a2fd

You can also restore that system dialog functionality by installing Files by Google app from Play (https://play.google.com/store/apps/details?id=com.google.android.apps.nbu.files&hl=en)