Here's the [file][1].

Steps:
 1. Select everything.
 2. File ‣ Import/Export ‣ FBX (.fbx)
 3. Turn on Selected Objects.
 4. Export FBX
 5. Upload character to Mixamo.

[![enter image description here][2]][2]

Expected:
 - Smooth surface
 - Uniform color

Results:

 - Areas around the mouth and neck are misshapen.
 - Head is grey. Body is white.

I'm worried that this might become a larger issue when I start to rig and animate this. How can this be fixed?


  [1]: https://drive.google.com/file/d/1k2E0v2a3YTJyuV6bu-ufYU2I-x5RcEn8/view?usp=sharing
  [2]: https://i.sstatic.net/yOY5F.jpg