The Raspberry Pi supports only one MIPI CSI type camera (the kind using a flat ribbon cable). I saw one person assume the LCD display connector could also be used a camera connector since they both have 15 pins, but of course that not true. I am not sure, but maybe you are thinking about the 4-to-1 camera multiplexer from Arducam:
https://www.arducam.com/docs/cameras-fo ... oard-v2-1/
This is obviously an aftermarket hack. To my surprise, allegedly it sometimes works, but that's all I know. You can still only use one camera at a time, and I am not sure what application would be better off with that configuration, instead of simply using four separate R-Pi boards each with their own camera.