Unable to import Datasmith files

I’m new at this. One of my friends did something really cool in Unreal and I thought I’d try it out. So I installed the 4.22 version of Unreal and loaded the 3ds Max exporter but when I try to import the .udatasmith file I exported from 3ds Max it doesn’t see it. The Datasmith importer isn’t in the list of importers, so I must have done something wrong. Can someone help.