Grant channel access, remove members, audit shared files. Every one is ready to run, and you can adjust it in plain language.
Report channel removals and unresolved cases after each access review.
Keep your discussion channels aligned with access reviews, and give reviewers before and after member lists.
Give file owners a private list of sharing grants to review.
Your file owners see which open links and outside grants to revisit. Private reports point them to recently changed files.