Can't edit/delete files on external storage
Poweramp will ask for such permission of first attempt to edit tags / delete file on the storage if the permission is required.
Please note: "documents" standard app is used for the permission dialog and if this app is disabled / uninstalled / frozen or if ROM doesn't have this app or if the app is otherwise broken Poweramp will never get the permission and tag edit / file deletion will fail.
Tags: can't edit/delete files on SD card