I think that the 933 is similar to my 931 -
WiFi extender ONLY works with WiFi, stops transmitting when cable is plugged in.
I had the same need with camera at end of a very long Ethernet (powered by Power Over Ethernet, TP-Link TL-POE200).
My solution was to use a travel router (ZyXEL MWR102) at the camera location, acting as an access point, and let the camera hook up to that router's WiFi (since the single cable was used up by the router, and no room/power for an ethernet switch.