I'm having the same problem with Fedora 34; copy-and-paste isn't working between a Windows 10 host and the VM.  File drag-and-drop between the Windows 10 host and the F34 VM is also not working.

FWIW: I'm using the KDE/Plasma spin of F34, and I've tried both the Wayland and X11 login options.  (I typically use the X11 login option.)

Have you figured out a solution to this problem?