First flight with Firmware 1.0.4 and DJI Fly 1.0.4:
Some colors invert white to black upon preview using App DJI Fly 1.0.4!
The problem does not exist when I watch the video.

Screendump

I believe that is the overexposure warning but not sure

Hi. Thank you for reaching out to DJI Forum. With regards to this concern. Please reset the camera settings of the said drain to isolate. The inverted colors which usually looks like a zebra line is an indication of over exposure settings. Please keep us posted for further assistance. Thank you.

You must turn of the overexposure warning switch switch which can be found at the settings over advanced camera and right below histogram

Niknik Posted at 1-6 17:16
You must turn of the overexposure warning switch switch which can be found at the settings over advanced camera and right below histogram

THX dude, fixed.

InspektorGaDJIT Posted at 1-6 22:31
THX dude, fixed.

Happy to help

Over exposure warning.

It's called "zebra" , used in most video cameras, pretty handy to show over exposed areas but under exposed too, mini only show highlight but still super useful.