Well, my experiment with manual settings on my Hero 8 did not go so well!
This is how my footage turned out looking:
View attachment 4868
I've been trying to correct it in Shotcut and no amount of filtering and such can fix this, LOL!
Here are what my settings were:
ISO: 100-800 (low to hi)
1080p @ 60fps
Shutter: 1/120
Color: Flat
Sharpness: Low
White Balance: Native
And here is how a ride one minute later looked at the same spot with my normal fully auto settings:
View attachment 4869
The manual setting seems very overexposed but I'm not sure what setting is causing it?