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Importing Substance's Glass, is there a right way?

Hello everyone, how do you handle the substance to unreal communication with glass? My teammate do all the meshes/txtures, we never had a problem when I imported his opaque stuff, but we do with Translucent Surfaces. I thought I could just connect the T_Diffuse-Alpha to the opacity and all the relative T_ARMs (we have no Normal)… maybe add few nodes to refraction…but it doesn’t work: It looks like that the alpha value/opacity makes the roughness texture “weak”. In UE I get a very cheap, very transparent result compared to the substance rendered one.