OneDrive, Microsoft's file sync app formerly known as SkyDrive, lets you store your files online, edit Office documents in the free Office Web Apps, and easily access your online files from your PC.
Your review card shows when feedback names an older PDF. You can resolve the mismatch while the card stays in review.
Your maker gets a rework email that names the reviewed proof and fixes due next.
Keep reviewers aware of changes to a proof before they act on a decision. Your task shows the mismatch and asks for confirmation.