Hi Mirea. I can’t see the shapeways page without a login.
That said, there is no live preview of any files in the Gravity Forms upload. There is a third party plugin to preview more common image formats (like png, jpg, gif):
That will not work with those specific extensions you listed. Assuming you could find a web viewer for those image formats, you could probably preview them using the same method that the Gravity Wiz solution is using.