do you have the directory /srv/ftp?
No I don't, only thing in /srv/ is disk-by-uuid drives.
Not sure why it's there, the only thing I've ever done with ftp is add one share.
Should I manually change this to a directory that does exist? What should that directory be on a standard OMV5 installation?
Ok I just created that folder and everything appears to work now. Strange that it's the default setting, yet OMV doesn't appear to create that folder automatically, at least not for me.