This is a simple idea, yet one which would make my life (and many others' lives) easier.
I have multiple playlists, and often they overlap. Therefore, I would greatly appreciate when adding a song to a playlist, for a checklist or something similar to come up, where you could select all the playlists you would like the song to be added to.
Currently, I have to select the song, add it to a playlist, then repeat the process at least one more time in order to have it in all the playlists I want it in. It's very tedious. Please take my recommendation into account! Thanks in advance.
Updated on 2017-08-11
A similar idea has been posted here: https://community.spotify.com/t5/Live-Ideas/Desktop-Playlists-Add-Song-to-More-than-One-Playlist-at-...
Please add your comments/votes there, and reach out here if you need any other help :)