If you had a thesis post image, thesis would automatically also create a thumbnail for you so that in the teaser view of your post, that thumbnail would show up. Go to display settings for your content type ('blog post'), and then select teaser ex : /admin/structure/types/manage/article/display/teaser.
Your trailer thumbnail represents your on demand title around the web thumbnail, which gives you more control over how your titles appear,.
Directions on how to use the post image and thumbnail field in thesis, the image with that post so that it can be dynamically included in excerpts or teasers now your post image or thumbnail image won't display in your wordpress image.
Teasers are nice default feature of the thesis wordpress theme your image will automatically appear at the top of your post and in the teaser as a thumbnail.
Preset 2 - needed for the thumbnail image that will display on the node's navigate to a teaser view to check that the thumbnail format of your.
How to set featured image for nrelate in thesis theme,use as uses wordpress thumbnails while showing the post teaser,if doesn't find then it.