Ok, so It looks like as in my picture above, yellow frame and video. And if you manually record a video from the camera the recording is in the Library. This is how the default config for MD is for me. The Signal bar position is by default Hidden. Make that visible and put it somewhere in the image. The signal bar goes to red when MD is triggered and a recording start. Check so that happens. If that happens the video should appear in the Library list. Look in the Event logs and see that you have green icons on recordings. If the icons are red it is a problem.
You can also check in the Library folder on the disk if there are MD files there or not.
