Freeze the approved content
Do not begin final output while facts are still moving. Confirm cover and issue identity, contents and front matter, feature stories, recurring departments and credits, contacts and next issue and record the approved revision. Issue date, contents references, bylines, image credits, page numbers and contributor details need editorial checking.. Run spelling, design and accessibility reviews, then save the editable .mpub before creating a PDF. A later correction needs a new proof; editing after approval without repeating review breaks the audit trail.