12.5.1 under iOS 15.1
I was able to sync Joplin with next cloud server for a long time.
Today I decided to encrypt my notes and got the following error.
What should do next?
Good old FileLocked error. It's a Nextcloud bug and you need to add Redis for file locking.
How do I do that?
There are dozens of posts about this in this forum and maybe even more on the official Nextcloud forum, so you'll probably find what you need if you search.