If you have upgraded to macOS Catalina, you may experience an issue while trying to record prototype interactions in the desktop preview window. The recording button may blink and appear to record, but the timer is stuck at 00:00 and no .mov file is created when you stop the recording.
With Catalina (10.15), Apple has introduced a new security and privacy update for Mac. You must now allow apps to record the contents of your screen. You can enable screen recording by navigating to System Preferences from XD or from macOS.