Mac client V10.41.5 (MacOS Monterey V12.4) and apparently it doesn't work.
Same goes for Windows 11 (V10.0.22000) unfortunately.
Unless I'm doing something wrong... Clicking the pdf in the note so the border turns blue, I can drag but not drop. It simply doesn't do it...
Trying to drop in the Finder window on Mac or the Explorer window in Windows 11. No luck. On Windows 10 Enterprise (V20H2) I can drop it to Explorer.
Actually, windows 11 may be a problem on its own. I'm not really a huge fan of it...
Apparently, I can drop it in an Outlook (V16.62) mail message on Mac but unfortunately not on Windows 10 (Outlook 365 V2102) nor Windows 11 (Outlook 365 V2206).