I am having the same issue where i am unable to add songs to existing playlists. I tried to follow the instructions above by clicking in other places (both on the app on iPhone and on website) and i am still unable to add the new song to an existing playlist. I only have the choice of adding it to a new playlist or adding it to My Tumbs Up. I followed the workaround by adding it to a new playlist. The steps above indicate that i should then delete the new playlist. I can't figure out how to delete the new playlist. Help!
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