I want to be able to add/remove large quantities of music from Your Music on the desktop app, but the only way to do that as of now is one track at a time. I can select multiple tracks with shift/ctrl + click or ctrl + a, but from there I can't save or remove them.
Updated on 2017-08-21
This is actually already possible on the Desktop.
Simply right-click a selected track (or a selection of tracks), and click 'Save to Your Library'. A tick will appear next to the track(s) on the left-hand side to show you that they're saved.
To remove them, simply follow the same flow, but it will say 'Remove from Your Library' on the drop-down menu.
Hope this helps!