Thank you both for the explanation! It’s helpful to understand the issue for the future.
I realised the invert normals were unchecked and checking it made it okay when importing in to UE4 yay!
Kraid, by converting the model do you mean to a fbx format? What would be the best way to optimize them in your experience?
Sorry for the many questions. I’m still new to this pipeline and would love to learn and understand more from you guys!