Set up an approval task with one current proof, a decision question, and a due date.
Assign the current proof to a reviewer with a due date.
Your reviewers get a dated task for the current proof, with the decision they need to make before launch.
Keep the current proof clear in each approval handoff.
Your reviewers get a clear task for the current proof. They know what decision to make and when it is due.
Turn proof signoff commitments into dated reviewer tasks.
Your reviewers get a clear task for the proof decision, with the link and due date from the meeting action item.