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.
Put campaign requirements beside assets awaiting approval.
Your reviewers see the brief beside the asset, with the brand decision they need to make clearly stated.
Attach the latest campaign draft to each brand sign-off task.
Your brand reviewer gets the current campaign draft and the decision needed together on the review task.