[Substance Painter-UE4] Metallic and Specular export process?

polycounter lvl 6
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Croftyness polycounter lvl 6

I'm really enjoying substance painter right now. However I'm confused as to how I can export Specular maps for UE4. IN SP the only shader option I have is Metal-Rough, from my UE4 understanding metalness is not what I want as I've been painting specular maps. In the export options there IS a gloss-specular option which is what I want, however doesn't export the maps I want.

What would that standard file set-up and export process be for albedo, spec, rough and NM from substance painter to UE4?

Much appreciated.


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