Do I need a motion sensor in a room that already has a camera?

Hey there, I just setup and installed part of my Ring Alarm system. It is all going in a small, roughly 300 square foot room. I will have a ring wired camera, and a ring battery camera in the same room. My question is: Do I need to also install a ring motion detector in the same room I already have ring cameras? The reason behind the question being, don’t ring cameras have built in motion detecting already?

Motion detected by the cameras will not set off the alarm.
Motion detected by the motion detector will.

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