So I'm creating a shoe model and I can't identity a problem in my object still after wasting a lot of time. The back side of the shoes have vertices that doesn't smooth along the whole shoe object when I press '3'. As you can see in picture 1, the geometry of the object is fine. I even checked the duplicate extruded faces, edges or vertices and the if the vertices are not merged. But it looks fine to me. I'm attaching my file along with some screenshots. I need help!
