Thanks CalebJohn, I just did a cursory glance at the product. It seems to be a more and more common thing to NOT provide WebDav any more. I’m waiting for MS to pull it from OneDrive some day.

I used a file system sync and it worked OK, it’s just got a few gotchas. More than once I was in a hurry, made a change to a note, synced it in Joplin then shut down - before the cloud provider (in my original case Google Drive) did a sync to the cloud. I also had to buy an app to sync the actual FILES to my android phone, not just just provide access. I now use OneDrive to sync directly which seems a bit tidier.

It seems that file system sync has a tendency to hose up but quick, especially if using more than one device at a time and the sync goes haywire.

After I’ve added or edited a few notes I’ve started shutting down the cloud sync agent and doing a full 7Z (ZIP file alternative) backup of the Joplin profile. I’ve always used the Joplin portable version just because of this.
More than once I’ve had to restore from this 7z file to get the notes straight again.