The true Sky lights I used in the UE4 engine were not the same as the native lights, and the True Sky lights did not render PBR materials correctly, especially in shadows. True Sky Light Units will not render properly after selecting Photometric, even if auto exposure is adjusted.
Apologies I cannot see this image due to your twitter permissions, could you post again on a different image hosting site?
I’ve cleared it. You should be able to see it. Thank you