Smart Detection tells you whether the activity that was viewed by the camera is a Person, an animal or a vehicle. There may be times when the detection is unsure what is seen and provides a notification without a “smart” designation.
For Smart Detection to work, you must be subscribed to a Plus or Premium subscription plan. If you are on one of those plans and your notifications are not indicating if the activity is Person, Animal or Vehicle, you may need to delete the current rule that generates that notification and set it up again.