Record which revision of a proof was sent to the reviewer.
Email the current creative proof and log the revision on the card.
Your reviewer gets the current image or PDF and a clear question. Your review card shows which revision you sent.
Log each proof handoff with its reviewer and revision.
Your team gets a dated record of which proof revision went to each reviewer, even as work on the board moves forward.
Log the exact proof revision when a review card moves.
Your review card shows the proof version your reviewer received, even if the linked file changes later.