Upscale 4K can make the video more details in Youtube when viewing in 4K option. It is because Youtube 4k bitrates is more than 1080p but viewing in 1080p, it should be the same.

It is the first time to record RAW and non-stop 18 mins.
Lexar CF card is fast enough to record 1080p 23.976.
Will test 30p next time or higher resolution in crop mode.