According to this Amcrest page https://support.amcrest.com/hc/en-us/ar ... -IPM-721S-, when I am trying to set the sensitivity and threshold for video detection, I should see "Motion that's triggered will be seen as red bars. Motion that's detected, but not triggered, will be seen as green bars." I don't think it works with the latest 721S firmware. (I don't know if it worked before.) Even if I set the sensitivity to 100 and the threshold to 0, I never see any red or green like that shown in the animated GIF on that page. However, I did get snapshots and video recordings for several motion detect events in that period.
Does it work?