using Workbench render engine.
Storage : 200GB of 450GB (Disk).
The imported models version of blender is 2.81.
Short description of error
When importing .blend/.FBX all materials are white. (Maybe this happens because the model is using the Workbench render engine?)
Exact steps to reproduce the error
First the model is imported to unity, and I change a few settings. (such as: rig type : humanoid, avatar configuration).
here is a picture of how the character looks in blender and in unity.
Here is blender :
And here is unity :