I just notice while checking with a smaller set of files that the error seems to be linked to file size. Most (did not check the whole list) file exceed 10MB. I also found a 3-years old thread that 10MB was a limit with nextcloud client. A fix was promissed. Maybe it is a regression?
I am facing the same error message when synchronizing with Nextcloud client. Any idea, what is causingthis issue?
Customer support service by UserEcho