The mordant does not play. I wanted to show this by example, but there is no video export either. Why?
Ornaments don’t play back yet because we have not yet implemented playback of ornaments. Dorico does not have a video export feature but you can of course capture a video using any other screen capture software if that is something you need. On Mac, you can use the bundled QuickTime Player application to make a screen recording; on Windows, you can use e.g. CamStudio, which is open source, but other similar tools are also available.
Thank you. You answered my question.