Cloud sessions - do all collaborators need to upgrade?

[hw2nw]

Hi all - trying to work on some singles for an artist while under quarantine.

There are two producers and a couple musicians, and i'd like to run a cloud session.

My question is - if I upgrade storage, does that cover across all users of the session, or does every unique user logging in need to purchase the extra space? I'm assuming it'll be 2gb/song or so, so i'll need a little more than the free space.

Thanks!