Substance Painter Opacity doesn't work in Unreal Engine 4

How do you even make Unreal Engine opacity work after I exported as Unreal Engine 4 (packed) from substance painter to unreal engine 4. I want to make the glass of my vending machine to be transparent but it don’t work in unreal engine 4, can someone help me? For reference, this is my model - https://ibb.co/d8oH0p