Rather than clicking "Add to Playlist" and choosing a new playlist time after time, allow the user to "check" a box next to the playlists they want to add a song to, so they can quickly add/remove from multiple playlists at once.
Edit: This idea has been reposted here.
Updated on 2019-08-29
Your idea has been submitted a while ago but unfortunately hasn't gathered enough kudos (100 per year). In order to keep an overview of the active & recent ideas in this forum, I'll close this idea for now. However this does not mean that your idea has been declined by Spotify.
If you still feel strongly about your request, I encourage you to post your idea in a little different form again! Maybe now is the right time to receive the support of our community for your suggestion! 😉
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