Set up an approval task with one current proof, a decision question, and a due date.
Assign ready campaign proofs to reviewers with due dates.
Your reviewers get a dated task for the current proof, with the decision they need to make before launch.
Put the current campaign proof in the reviewer's task.
Your reviewers get a clear task for the current proof. They know what decision to make and when it is due.
Assign campaign proof decisions captured in meetings.
Your reviewers get a clear task for the proof decision, with the link and due date from the meeting action item.