yeah, I can help but I need more information;
the UV map is the layout of the model's faces saved in the UV face editor. it merely defines where the image goes on the model. there are multiple methods for saving the UV map 1; in the actual .blend file, 2; as an image, and a few others, what file format (ex; .blend, .tga) is XCOM 2 asking for?
if it's in the actual blend itself then it's a simple settings thing. which means I need to know what version of blender you are using and what texture/images you are using or what you want to the images to do.
Example: 1; my image is just to color the object, 2: my image is to make it look more detailed than it is and reacts to light, 3; my texture makes it reflective.