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.
Check reviewer access to the current proof on the project task.
Your approval task shows whether the reviewer can open the current proof before the due date, with a request for a corrected link when needed.
Show proof access gaps on the review card before assignment.
Your review cards show whether outside reviewers can open the current proof, so access gaps surface before work reaches them.