@WillamH, I had a look at the missive, and while Scrivener will need to comment on this, they should probably be doing so in the Scrivener for macOS forum (I donât think anyone refers to it as OS-X in a long time).
I think you donât have to worry about the iOS/iPadOS side, once again as Scrivener has done the right thing from long ago, and used DropBoxâs API to directly communicate, rather than laziliy doing so in the filesystem. This is why it works so reliably and well, with the Files app or worrying about files being nonlocal not being needed.
On the Mac side, there could be more question, but if you follow the missiveâs the company was working on a solution link down the page, you can find that Dropbox is aware of the potential problems with external filesystems and is providing a fix, including not implementing this Apple change for current users until they have that fix in place.
That leaves a question in my mind, about Mac local files Scrivener projects. I suspect itâs not a problem, though Dropbox long ago changed their own implementation to by default have files only in the cloud, not local,to be downloaded when theyâre used. This can be quite a flakey situation, but as I never see the problem with Scrivener projects, I think Scrivener has done something to assure their project files are ready locallly when needed.
Iâm saying this from Windows, but it must be true for Mac also, or there would have been an avalanche of complaints. How they do the assurance I donât know; possibly automatically marking all their files in Dropbox as do-not-only-cloud. But it seems to work, as again persons donât complain of files not being present when they are not on the internet, and havenât themselves manually marked projects this wayâŠ
I would take your question to the Mac part of this forum, and ask again, I hope with less anxiety. Maybe this post can help calmness and thus writing a clearer questionâŠbest on it, and that your working turns out undisturbed, as I suspect it willâŠ
(and just to say what you surely know, reliable backups are your truest friend alwaysâŠ
)