I have the same question as a long time Studio One user who recently subscribed to Sphere and upgraded from S1 Pro 4 to Pro 5. My band members use different DAWs, some Studio One, some others. We had all been using Soundtrap from Spotify as a "lowest common denominator" for the cloud, and then I would export and mix in S1, but it would be great to use S1 and share files in the cloud via Sphere. They don't do any editing, only tracking. I do all of the mixing and editing from here.
It would be great if Band members could track to my Sphere project with Prime and Artist. Thanks.