The pre-installed cam controls the floodlight.
The primary camera, a Wyze Cam v3, that comes pre-installed in Wyze Cam Floodlight controls the floodlight and its settings. This includes turning it on or off manually or using automatic features like motion detection or Rules.
If you add another Wyze Cam v3 using the second USB port, that camera will work as a normal camera without controlling the floodlight.
Wyze Cam OG, Wyze Cam OG Telephoto 3x, and Wyze Cam Pan v3 can also be powered by Wyze Cam Floodlight but are unable to control it.