Site Model & Plants not importing into Twinmotion

I'm trying to get my site model and associated plants into Twinmotion but when I import it (via Datasmith Direct Link) nothing appears. It says it's importing, says it's finished.. but nothing. Does Twinmotion only work with buildings or can you import your landscape design in there as well? I would have thought so, but all the examples out there only demonstrate it with buildings). I did a test by manually creating a small simple terrain and a box building and

I have been making some progress.. I've even worked out how to replace the VW 3D tree objects with Twinmotion ones (although it's of only limited use). However the thing that is still puzzling me, is how to create a pond. I thought that if I created a solid fill for my ponds (using an extrusion) in VW (se picture) I could apply a water texture to it in TM, but that doesn't work.. I've tried playing with water cubes (no good).. so I was wondering if anyone has any experie