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.
Keep review handoffs tied to the current draft and revision task.
Your creator gets the reviewer's requested changes and current draft together, so they can start the next revision without chasing files.
Record each review handoff on its campaign task.
Your reviewer gets the current asset with a clear request, and your campaign task keeps the handoff in view.
Keep creative reviews supplied with the approved brief.
Your reviewers see the brief beside the asset, with the brand decision they need to make clearly stated.
Catch sharing gaps across campaign review handoffs.
Your review task shows file access problems before review starts. The owner sees what to fix.