12v WS2811 & ESP32 not doing as expected

Im new to WLED so this may be simple.

I have my ESP32 powered by a 5v usb via the micro usb port,

i have the 12v WS2811 connected to a 12v battery and i have the green data wire connected to GPIO 4.

i can see the controller fine, but the trip only half lights up and does some random multi coloured flashing instead of staying solid.

i bought a 1m strip to test with, listing says it has 576 leds per meter but regardless of what i put in only half lights up and i have no control over the strip.

Appreciate you time.

Make sure the ground (-V) connection on the LED strip is also connected to the ground on the ESP32.
You must have common ground between the ESP32 power supply and the LED power supply.

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