STL-Preview? Answered

Hey,

I've already posted this within the FAQ-Area, but since nobody responded it might be better suited for this area.

I have an instructable with 3D printed parts, so I added the *.stl-Files, that can be used for 3D printing.
However I dont see them correctly within my instructable.

Is there a way to get them displayed correctly with a preview-image?

thanks in advance!