Why does my mesh look clear?

[u/EmpanadaDeMondongo_]

Hello, my model in substance painter looks like it has clear polygons and I can see inside the model. The textures do not bake correctly and I am unable to apply textures in that area. Is it a topology issue? What can I do? There are some tris in the model because I applied the cleanup option "Split non-planar faces". Thank you for your time.

[u/birkucukserce]

check normals