We can connect to WinSCP server by using Windows Powershell terminal. But we can open Powershell in iTest through telnet/ssh, by connecting to the local host and bypassing the console utilities virtual console. Not all telnet/ssh server works here except WinSSHD. You can download and install the WinSSHD personal edition that's free.
And follow the below process:
Attached is the testcase for reference.