Post thumbnail appears only in Blog and News template......need help

I figured out that the user generated gravity form that uploads post stories and images does not show images in any places where the posts are except for a page I created where I chose the "blog and news" option under the "template" drop down. This is how I want the posts to appear with the image...however, when you click through to the actual post it does not have the image. Why does it only work under "blog and news" template only.....
Thanks!