Most of us do not use Motion Detection or Smart Motion Detection in the cameras - we use Smart Plan and IVS rules as they tend to be more accurate.
Post a screenshot, but without seeing it, the camera needs time to see the object and run it thru the algorithm and decide if it meets the criteria, so something zoomed in too tight and resulting in the object being in and out in a flash will be problematic.
Also, make sure you followed the steps I told you about default settings. If brightness, contrast, etc. are all on default settings it will miss. At a minimum contrast should be 6-8 points higher than brightness.
Post a screenshot, but without seeing it, the camera needs time to see the object and run it thru the algorithm and decide if it meets the criteria, so something zoomed in too tight and resulting in the object being in and out in a flash will be problematic.
Also, make sure you followed the steps I told you about default settings. If brightness, contrast, etc. are all on default settings it will miss. At a minimum contrast should be 6-8 points higher than brightness.