Timelapses are pictures your cameras take every five seconds. You can use them to view those time frames that do not have a video.
This will help you understand why the motion detection worked or didn't work.
1. To view your Timelapses, go to the appropriate tab in the left side menu.
2. Here you can select the date for which you want to see the frames, as well as the time and play speed of frames
3. By default, the slider is at the current time, so you need to scroll it a few times back to start viewing.