This question is same as some other question Exporting OBJ missing map_Kd, but I have more detailed information to explain.
So, I have this .blend file which for each face I conducted smart uv unwrapping, and assigned some texture image.
When I try to save this scene into .obj file, the resulting mtl file does not contain the texture image names.
Can anyone try this and let me know what is wrong?
Thank you in advance.