Floodlight camera video not available

I have our motion sensor set to trigger at any motion, even a cat in the driveway. A couple of times recently, I've tried to view videos from the night before and they won't load. At the bottom where the play button is and it usually shows 0:00/1:06 it shows 0:00/0:00. I copied the video url to try it in a new tab and it says This video is no longer available. The person who owns this video has decided to remove it. For more information on shared video management, visit our FAQs. Does this mean the motion sensor was triggered but the camera failed to record anything? When it happens, it's usually over a period of several hours - so there will be good videos, then several bad ones, then good ones again. This morning it's working fine but there are videos from 24 hours ago that I can't view.