Ok so the bell is mounted. The camera pointed the right way. As a bell works great. As a video bell basically once you answer the results are fine. Key words are “once you answer”.
Just plain takes too long to bring up the app and answer. Usually by the time you can answer the bell gives up. Certainly no UPS person is going to wait while you answer. Now once the motion capability is activated this might work better. And of course if the phone had video notification built in that could help. Frankly I would be happy if the app auto answered muted till I touched the app, maybe then it would be fast enough.