Have a 'folder' for recent files. Have a time limit in days. To add to this have a 'folder' for each collaborator. We can see work evolution and be able to see what collaborators are working on and the status of the work.
If you really want to make this powerful allow for a comment on the work. "Jim, this is the latest version for our client approval. Please submit if you approve".
In summary this is a simple dashboard of current work.