Freeze the approved content
Do not begin final output while facts are still moving. Confirm cover and catalogue scope, category navigation, product name and image, features, variants and price and ordering, terms and contact information and record the approved revision. Product codes, variants, dimensions, prices, availability and terms should come from a controlled source rather than retyping.. 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.