" This is a security 'feature' of Android, apps can only modify the contents of folders that they created. "
Some apps must be be able to get past these security settings somehow, because Poweramp has a setting that will let you to permanently delete sound and music files from your device running Marshmallow.
I like this feature because if I'm listening to a song and find something I don't like about the song, I can delete it from the device.
Also, file managers such as ES Explorer can delete files they didn't create.
07-17-2016 02:35 PM