Iflight GOCam PM GR User Manuals page 7

(3)FC Recognize Camera
For instance, connect camera to UART3( corresponds to R3, T3): connect FC to your
PC, open parameter adjustment configurator ( choose the corresponding software
according to the type of FC firmware, such as CleanFlight Configurator or BetaFlight
Configurator). Then choose RunCam Device at Peripherals in UART3 and click Save
And Reboot.
(4)Binding Camera Control Function With Channel
Enter Mode page, at the bottom of the page, you'll see CAMERA WI-FI,
CAMERA POWER, CAMERA CHANGE MODE.
CAMERA POWER: Start and stop recording. Select the next in OSD mode.
CAMERA CHANGE MODE: Switching between Recording and OSD mode.
Exit the page in OSD setting .
Bind the functions you need to any available channels.