To Copy and Paste during a VNC session works the same as usual. Windows users can use the Ctrl+C, Ctrl+V combination. Mac Users use Cmd+C and Cmd+V. If however your server is a Mac and you’re connecting from a Windows machine, you need to press Alt+C instead of Cmd+C.
Copy and Paste only works with text. You cannot copy images, drag-and-drop files or other non-text items.
Should you experience any problems consider the following:
If you have copied a large amount of data that exceeds 256kb, you will not be able to paste it. Instead the most recent item in the Clipboard will be pasted.
It is possible that the copy/paste feature has been disabled on your VNC Server. You can check by accessing the global permissions from the VNC Server Options > Users & Permissions menu.
The ability to copy and paste may be user specific. Check if you have permissions in the VNC Server Options > Users & Permissions settings screen.