Ring Doorbell not alerting me when people are at door

We just purchased the ring doorbell for security purposes. We are noticing that often times, motion isn't detected until the person is gone from our door, if at all. Often times, we get NO person detected notices. For example, I set out free clothes for someone to pick up right in front of our doorbell so I could be notified when they picked them up. There was NO motion/person detected. We have it on high sensitivity as well. What the heck is the purpose of this device if it doesn't do its job? Any advice or should we just return the thing and get a different type of device.