I think it would be great if when adding a song to a playlist, you would be able to search for the playlist you want to add it to instead of scrolling all the way to find it in your playlists. For me, I have tons of playlists so when I want to add a song to one I made a while ago it is a bit inconvenient to have to scroll back a bit and find it before adding it. I wished that when I pressed add song to playlist my playlists were sorted by maybe even how often they’re used, so the ones I use and add too a lot are more easily available quickly. I hope this makes sense hahah.
Updated on 2020-07-01
Hey and thanks for your contribution!
A similar idea has also been suggested here
Add your vote and comments in support there please : )
Note that this is Android related, if you want to suggest a separate idea for iOS, feel free to post a new idea : )