UPDATE: This method only works for Betaflight 4.3 and NOT 4.4

Quick video to show how set up the MSP DisplayPort (also known as canvas mode) to overlay the Betaflight OSD while flying and recording DVR in the DJI Goggles 2. I also take it for a test flight and share my experience with it.

The settings to type into Betaflight CLI:
set osd_displayport_device = MSP
set displayport_msp_serial = [UART number] - 1
save

Example (shown in the video):
If the UART you connected the Caddx Vista or Air Unit to is UART 3:
set displayport_msp_serial = 2

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