Hello,
I systematically have problem with Drag&Drop in 2 directions between Unbuntu 18.04 and Windows 10.
I use it almost without problem between Windows 10 and other Ubuntu or Debian versions so I suppose it's particularly related to Ubuntu 18.
When I drop a file to Ubuntu guest, at best it goes to /tmp/..droppedFiles (I Don't remember the name exactly) but not always and this morning this folder is even not present.
And sometimes I see a dialog. In that case I have to reboot the VM.
I can't drop a file on Win10 host at all.
I use the last available Guest Additions.
Any idea?
Al