UltraVNC

Server & viewer are both uVNC, but I cannot get the server to show 'file transfer' option as it shows in the documentation. Currently using uVNC Server 1.3.2a. The server does not have the 'file transfer' option as shown in the above link, only Full Control, Interact & View.

I'm in the same boat. Got it to work a few times, then doesn't seem to ask for encryption at all even when checked on uVNC server.

I am trying to configure uVNC as shows in this image from uVNC documentation: https://www.uvnc.com/img/mslogon.png
How do I get this feature as shown in the documentation?
I have tried latest version and older versions but they do not have the 'file transfer' option as shown in the above link, only ...