Story files aren't showing the thumbnail pictures

I hope this is the proper place to post this.  I have tried multiple times to allow my saved story files to show the thumbnail instead of the Articulate icon to no avail.  I've been in my setting to make sure I've marked to show thumbnails instead of icons. Is there something I'm missing with regard to story files specifically?  At this point I'm opening each file (to see what's inside) and then renaming them.

Any help is appreciated,

Erin