Do you have a sample file that contains 3D model covering the aspects you want to be interactive for people to experiment with?

I cant attach sample file because format is .stl

"Couldn't attach selected file:«borer.stl» has an unrecognized extension."

OK. So what application opens such files?

Native file format to the stereolithography CAD software created. Most commonly used as an export for 3d print or for viewing the model. All 3D model apps support it

You can attach the file by changing it's extension to [.txt] for example and in the post indicate to change it back to [.stl] to use and experiment with.

Also see http://b2evolution.net/man/file-types-list

@markommb Go to Files > Settings > File types and create the new extension.