Google Docs is such a pain sometimes... If you don't have "Edit" access (i.e., only comment access) to a document you can't see its revision history. Though when you first open the document, it offers to show you the changes since you last opened the document... 1/2

Dec 14, 2019 · 12:29 AM UTC

1
... but those are the changes since you last opened it, not since you last actually reviewed it. And once you've looked at that view of changes since you last opened the document, and closed it, you can't get it back. So you're just supposed to review all 20 pages again? 2/2