P.S.: all textures/materials are ok. But when I go in skeleton editor in UE4 then the iris in the white eye. If I move iris in skeleton editor and click to Save then UE4 doesn’t save.
Was the Iris originally solved via texture?
If so, did you set up the material for it?
If so, can you post a screenshot of the material editor for that shader?
It’s not the iris that’s the problem but the cornea. In Daz Studio the applied material uses an opacity material to create the reflection and refraction of the cornea which does not get imported as part of the material layer. Just find the cornea ID of the material and apply a translucent material. I found that polished glass works well.