I had the same issue. For me, running sudo vnclicensewiz on the server and filling in the forms corrected the problem. The file transfer doesn’t work on the potato as it does on the pi’s and you have to login via your team (cloud) vs a simple ip address on your network. And for the life of me I can’t find a command to set the default video output to HDMI, so the remote window is 720 x 5xx. My workaround is an edid emulator in the hdmi slot. Hang in there.