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.
Reopen the design review task with the revised image proof.
Your reviewer gets a task ready to review, with the replacement proof and its version named in a comment.
Put rejected designs in the designer's rework list with the review reason.
Your makers find rejected proofs in their rework list. The reviewed version and reason stay visible on the card.
Assign rejected design proofs to their original makers.
Your original maker gets the rework task and sees why the reviewer rejected the proof, with the reason tied to the reviewed file.
Put revised designs back in review with the latest proof named.
Your revised proof cards return to review with the new version named and the next reviewer due date easy to find.