Sometimes I think of or hear a song and I want to add it to a certain playlist but I’m not sure if it’s already in there, or I just want to know what playlists it’s in (e.g. I accidentally added the song to the wrong playlist and want to take it out, but wasn't sure which one I accidentally clicked/pressed on). It would be nice to to have a feature where you can check which playlists of yours a song has been added to. I know that you there’s a notification if it’s a duplicate, but it would be more convenient if the song is in multiple playlists to just see all of them at once rather than getting that notification one by one for all of them, if that make sense.
Edit: someone in the comments suggested having checkmarks next to the playlist names in the "Add to playlist" drop-down and that would be perfect!
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