Files stay when a deck is deleted, and collaborators' uploads count for the owner
Deleting a deck, previs or walkthrough keeps its files. Deleting one removes only the deck, previs or walkthrough itself. The files that came from it and are in your Library stay there and open as before.
Files in your Library keep counting toward your storage. A file that came from a deck, previs or walkthrough you deleted used to drop out of your storage total even though it was still stored and still in your Library. It now counts toward your storage for as long as it is in your Library. Your total may be a little higher than before if you have deleted decks with files in your Library.
What collaborators add counts toward the owner. Videos and files that people you have invited to a deck, previs, walkthrough or project upload to it now count toward your storage, not theirs, even when they are not on your workspace's team. This also applies when you invited them by email. Files they uploaded before October 15 still count for them where we can't tell which deck they went into. On the Storage page's Team tab, what collaborators added is listed under Others. Your total may rise if people you invited have uploaded a lot of video to your decks. Going over your limit deletes nothing: new uploads pause until there is room, and on a Free or Basic plan so does making new files.
Collaborators see whose storage is full. If a collaborator adds to a deck whose owner's storage is full, the message says whose storage it is and that the owner can free up space or upgrade, and the owner is notified.

