There is default a TFTP server at the WCS server which I’m using a lot….
When you do a restore of the WCS server with no controller configured, the TFTP server isn’t working.
You need to add atleast one Controller before the TFTP service is active (It’s a WCS service and not a windows service, so you can’t start it manually.).
Then you can upload/download files from the WCS TFTP Service.