It seems like there was a change in how exporting datasmith files worked from previous versions of Twinmotion.
You will need to create an UnrealEngine project first and have it saved somewhere on your computer. Once the project file is created, UE creates a folder in that saved file location where the project will access all of it’s assets. In Twinmotion, you will need to export the datasmith file into the UE project folder directly. You can’t just export datasmith files to random folders anymore.