FBX Model appears in black

Development Asset Creation
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1

I have a FBX model exported from blender. Outside normals are fine, only some part is left inside to see if I can use two-sided materials to make them visible. However it doesn’t work. What might be the issue?

2

Could you provide some more information about the model? Maybe some pictures?

3

Ekran Görüntüsü (3)
Ekran Görüntüsü (3)1920×1080 114 KB

This is what it looks like right now, in blender its all blue, but when importing to unreal i need to invert normals, idk why.