And, I am a single user; my setup includes DropBox, which was setup precisely as described by L&L and which util today worked flawlessly on both my Mac and on my iPhone. On the iOS side, I am running 11.2.6. I do use iCloud. My Scrivener file path is: /Apps/Scrivener/MyFile. Pretty conventional and very dependable until today.
When I opened Scrivener today I learned that
Scrivener does not support read-only projects. Check the permissions for this project in the Finder
This happens when opening through Scrivener, or double-clicking from the Finder. The odd thing though is that I do have a previous iteration of the same file living in the same path; opening that previous file via Scrivener or via double-click is successful.
Given this behavior, to me I could see little sense to make permission changes, but I have no idea what is happening.