Color Material

Hello guys. I am new in game development area on the Unreal Engine 4, since working with UNITY Engine and am having some difficulties.
Below is my workflow:

1 I created a Character in DAZ Studio.
2 I exported as .fbx
3 I imported the .FBX file in 3DS 2015
4 Re exported as .fbx
5 I imported the file. FBX in Unreal Editor with all materials and textures.

Here is the problem:

I had problems with the hair and the eyelashes but managed to solve.
but with the eyes I could not.

The pupil and iris have a single color.

Below the image:

dd34b19e7b07a04af5e69135b9c8a304651c13bb.jpeg