I attach the photo because this is a repeating error,
for sure caused by a strange filename that I can’t find.
I write “for sure” because this was happening also with owncloud,
and we didn’t migrate (we started from zero and reuploaded everything).
We have both Windows and Mac with NextCloud, I suspect the cause is a file with a strange character in the name caused by the Mac computer.
BUT, I can’t find any “1%”, can you help me to find it ?
Please check your logfile like the message tells you. Could also be that there is an issue with your setup. But the percent sign could be problematic because it might not be supported by all client file systems. Search your mac sync folder for such a file. If it is a temporary file of a program it might be hidden.