Please have Plex for Android store the music in a file location that normal users and applications can access. As linked below this is a feature several have wanted over the years for various reasons. My personal reason is since Plex does not yet have a Watch app. I want to sync or push the files,music, from my phone to my watch. Then launch what ever available music player on the watch to read the files. In my case Samsung Watch and Samsung Music Player.
2021 clean-up: duplicate