I'm editing the second release of a document I first "published" almost 13 months ago. By "published," I mean saved to PDF and gave to engineering to make available for customers through our application's Help menu.
Yesterday, when I opened the source file, the Add Images. Video, or File tool was grayed-out in the toolbar of the document I'm updating, but perfectly visible in other documents I'm working on:

After we checked my permission settings (and changed nothing), the tool magically came back and I added four images. When I went back to the Confluence source file today, the new images were gone:
I would appreciate any guidance anyone could offer on the missing tool and/or the missing images (the two issues MUST be related.)
Thanks,
Davis Smith