The camera's motion sensor worked without a hitch, as did the pre-buffer feature. I always received a push notification, and the camera never failed to record a clip when the sensor was triggered or when the doorbell button was pressed. I created an IFTTT applet to have a D-Link Smart Switch turn on a lamp whenever the doorbell button was pressed, and it worked without fail, as did my Alexa voice command to display the Ring Pro's live stream on my TV using an Amazon Fire TV Stick and Amazon Echo.
3 - If you do not answer the alert fast enough, you are locked out-- even though someone is standing at your front door. You cannot "turn on" the camera from your phone or tablet. If someone is there and you do not have an "ACCEPT" button on the screen, there is just no way to see or talk to them. This is obviously a software flaw. You should always be able to "wake" a camera remotely and talk to a person at your front door. Or maybe you just want to see the view outside your front door. You should be able to access the camera / microphone and enjoy your front yard.