After that setup any standard FTP client to connect using devices specific IP address (you need to know how to find your devices IP address), and using port 2222 (standard FTP port is 22). Like shown on image below (leave password field empty):
After that setup any standard FTP client to connect using the device's specific IP address (this is shown when starting the SSH server and also available under network info), and using port `2222` (standard FTP port is 22). Like shown on image below (leave password field empty):