Google Drive is Google's file sync app that lets you store all of your files online alongside your Google Docs documents, and keep them synced with all of your devices.
Route rejected assets into revision work with reviewer notes.
Your designer gets the changes reviewers requested, tied to the rejected file version, with a link back to the approval.
Catch older assets in creative review handoffs.
Your reviewers can decide on the intended creative file. The Agent flags outdated versions and asks the owner for the current one.