This plugin creates a thumbnail list of the available page templates.
page-template-thumbnailsdirectory to the
Page Attributes -> Templatesdrop down. Replace spaces with the underscore for legacy compatability (ex: Full Page Template =
Full_Page_Template.png). This is how the plugin knows which thumbnail is associated with each page template.
Wp-admin -> Settings -> Page Template Thumbsand set the options for the plugin. Be sure to set the Thumbnail Path to the directory where you saved your thumbnails.