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Please follow those settings before shooting!
Go to Settings / Camera :
For formats choose Most Compatible which is ( h264)
Turn Apple ProRes ON
Go to record Video and Choose 4K 24 or 30
Disable HDR Video ( High Efficiency)
Auto FPS should be OFF
Lock Camera ON
IMPORTANT! Before Shooting, in camera view uncheck ProRes Icon.
Make sure you have enough space on your device due to ProRes large filesizes.
Enjoy and happy shooting!
Razvan D.