importing FBX into Unreal Engine — it doesn't recognize the metallic map, and instead it connects the roughness map to the metallic input

Development Rendering
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1

In Blender, all my materials are set up correctly with separate maps for metallic and roughness. But when I import the FBX into Unreal Engine, it doesn’t detect the metallic map and ends up connecting the roughness texture to the metallic input. How can I fix this?

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2

Which version of the engine are you using?
Are you using interchange?
Can you share the FBX file and texture with us?

3

I’m using UE5.4. How can I give you the file

4

FBX doesn’t have a standard PBR material setup included with the format. GLTF is the only format I’m aware of that does.

5

Yes, I have no problem importing gltf. I remember that FBX was also fine before.