Good for you that it works somewhat. I'm my environment(s), it is much worse. I'm including these things to display the wealth of this problem. Perhaps these comments help the Support to indentificate the origin of the problem.
Case:
Host Kubuntu 20.04 / Guest 20.04 (reasonably latests updates). VMware internal sharing is disabled (since it makes things even worse, read further).
1.
Drag and drop a single file from host to guest or vice versa.
Result: does nothing, which is the best case of them all.
2.
Copy a folder with 9 files (mp3 and jpg) from guest to host, with copy/paste from menus
Result: does not do it. BUT:
a) There is VMware interfering with starting the copy within VMware itself. It doesn't matter much with 9 files, but with 1000 files it takes minutes to release the computer to something else.
Why is VMware interfering with this? It is just wrong - I might be copying within the virtual computer or copying to a network file. This should be ONLY a matter of the OS doing something at this stage. I suspect this is just broken with bad programming.
b) There will be 1-3, depending on the take, modal error message on the screen (see the picture). You have to quit them (that's what I mean by modal), in order for the VM to be released. They appear again and again when pressing something on the screen - so, it takes seconds for one to get quitted.
3 isn't bad, although they make absolutely no sense, but if the number of copies would be larger, you would have to quit tens of them, which would take minutes of waiting and clicking. Even reboot doesn't help - they just appear again. Trying to go to Terminal and kill apps, does not seem to help either - at least it isn't trivial to find what to kill. So, you are completely stuck because of VMware itself.
This matter of getting tens of modal error message is perhaps worse, if you try to do drag&drop or if you use internal VMware sharing. I have it disabled since it was so bad.
I suspect that this item b) is broken because of very bad programming.
3.
If you copy using standard networking (samba) between the guest and NAS-drive in the host networking, the VM still gets hang up when you give copy for a folder in the guest - I mean, VMware starts some internal copying which does not make any sense. It will take minutes, if the dataset is large.
I suspect this happens because of bad programming - confusing the order of things in a copy process.
