Why does this happen?
Usually right after i copy files/folders in Windows, a few seconds and get this...
I believe that it's the macOS Universal Clipboard.
What has this message got to do with Fusion?
Thats the result of too high expectations regarding drag/drop and shared folders functionality beween VM and MAC-host.
Use Samba or other industry standard tools to exchange files between host and guest.
I believe that it's the macOS Universal Clipboard.