I had that issue as well, but in this comment I was talking about editing a track's album art. It would upload the picture but not do anything with it. Very wei

I had that issue as well, but in this comment I was talking about editing a track's album art. It would upload the picture but not do anything with it. Very weird to have such a basic function be broken like that for so long. As for YouTube Music, it supports background play only if you subscribe, like regular YouTube.