Camera1 stopped recording after I added camera2 and selected record on it

[yosef]

I added a camera and the first / original camera stopped recording.

[yosef]

To clarify.

Had number 1 camera in place.

It was recording fine.

Then I added number 2 camera. It records

Number 1 stopped recording?

I can manually record but the motion detect mode stopped.

[StephenB]

Check that both cameras are included in the armed mode for the base (or whatever custom modes you are using).  https://kb.arlo.com/42/What-are-modes-and-rules-and-how-does-Arlo-use-them