Atlas Material into Stager

In this video we can see idea that we can use Atlas Material in Stager https://www.youtube.com/watch?v=GkcObacojRA

I try to send material directly from the Substance Web Assets into Stager or ..download and then import into Stager.. but it's not possible. So is it possible or not to use Atlas in Stager or we need to import object with its materials into Stager?