I had an interesting tinker this PM, harking back to a client engagement where we were using PuTTY on Windows to access a bunch of AIX boxen.
In this case, a colleague was running PuTTY on a Windows boxen, via Microsoft's Remote Desktop client, and was trying to work out how to paste text from macOS into the target Unix boxen, via PuTTY.
I setup a Windows 10 VM on one of our hypervisors, and accessed it via RDP, and downloaded/installed PuTTY.
Once I'd connected to an Ubuntu boxen from the PuTTY session, I set out to test the options for copy/paste.
Having proven that I could copy text from the Mac using [cmd][c] and paste it into Notepad.exe on the Windows boxen, using [ctrl][v], I tried/failed to do the same within the PuTTY session.
No matter what I did, paste failed to ... paste, in terms of invoking it via a keyboard shortcut.
Whilst the "right mouse button" action worked for me ( I've got the Apple Magic Mouse 2, so there are actually no buttons - the entire mouse is a button ! ), the keyboard failed ....
I dug around in PuTTY's settings for a while, and then found this: -
For the record, I'm running: -
and the remote Windows 10 box has: -