“If I understand you correctly, yes”
Terrific, I’ll deal with copyright as totally separate.
So far the only complexity has been ensuring clarity as to which versions of tracks belong to a specific mix as the project passes back and forth. Probably using unique folders for each mix that deserves export for testing on different playback systems.
So when the project gets ridiculously large from duplicating tracks how do we archive the original and carry on with a new version that begins with only the most recent mix? I’ll take a guess that the project owner removes the project from the cloud then creates a new version from which they remove redundant tracks then upload the new version and carry on.