DWG import just imports nothing - empty D

[herb64]

I wanted to test the datasmith import for CAD files, here DWG files from AutoCAD. Using UE 4.25.1
Having enabled the Datasmith Importer, Datasmith...

[herb64]

Starting to go into the interesting field of water shaders, I'm trying to understand in detail, how the translucent water shader by Epic works, which...