Photo View 360 View

hey guys. im messing about with photoview 360 at the moment. One thing im not sure on is how to give my assembly an actual surface to sit on (thus the shadow isnt even close to the model lol) the assembly is essentially floating. What i am looking for is the assembly to appear to sit on a surface, thus the shadow reflecting this in the renderings. I am modeling a ceiling light, and there for would like a shadow on the roof.

Cheers in advance!

SolidworksEducator Student