Request missing approval evidence, route requests to reviewers. Every one is ready to run, and you can adjust it in plain language.
Keep changed deliverables on hold until reviewers see the new version.
Keep client drafts from moving forward on an old decision. See what changed and who needs to review the current version.
Hold delivery until the right client reviewer considers the revised file.
Your delivery manager gets a fresh review when a client deliverable changes after sign-off, with the earlier decision linked and the handoff held.