I am unable to add tracks to a couple of existing playlists. The playlist show up on the main menu, but when I go at add tracks, those playlists don’t show up as options. The only thing that looks unusual about those playlists is they have a Qobuz icon to the left of the eclipses. Thanks
Are you trying to add tracks to a Qobuz/Tidal playlist, as if you are it won’t work. You would need to create a local copy of the Playlist which you can then edit (add & delete tracks).
You can do that via the Soundiz web application.