Using Parallels 15.1.2 and Catalina 10.15.1, I cannot use drag-drop from Windows 10 Explorer to Safari to upload files to a website I manage. I can drag-drop from Windows Explorer to Finder but not to Safari (at least on this website). Parallels is set to have full disk access in System Preferences/Privacy. Similarly I cannot drag-drop from Explorer to Safari on a Facebook post, so the issue is tied to Safari/Catalina, not the website. I can drag-drop from Finder. This problem has only arisen since the upgrade to Catalina. Any ideas?