How to plug opacity map from substance painter to marmoset?

Sani

I made opacity map in substance painter, exported it with grey channel and tried to plug it to my texture, but nothing happened (i'm using marmoset 4)

EarthQuake

There are a couple of different configurations, if you're doing something like hair or holes in solid materials, you'll want to enable a transparency model. Generally, the Dither model is what you want.

If the opacity map is in the albedo alpha channel, you can leave Use Alpha Alpha checked. If you have a dedicated map, load it in the slot here and disable that checkbox.

If it's a glass or something like that, you'll want to set Transmission to Refraction or Thin Surface.

There's a mask slot for these as well.