Copy file does not work, the copy dialog says because of IO error but SeaDrive should handle a bad connection and throw an error unless its absolutely impossible to fetch the data.
I noticed my SeaDrive was outdated and updated to the most recent version. That was non trivial because some error popped up. I uninstalled SeaDrive and Dokany manually and rebooted. Then the installer worked and after another reboot SeaDrive worked again.
I’m now trying again to copy some files and see what happens. Currently it says 13 GB, 10 files, 10 hours 30 remaining @ 350 kib/s.
Didn’t take much time and the same error from above appeared.