Set the thumbnail images for the Module's thumbnail navigation and also for admin preview purposes.
1. Module Admin
This image will be used as the Module's preview image throughout certain parts of the plugin's admin.
2. Navigation Thumbnail
This image will be used for the Module's thumbnail navigation when the Module is viewed on the front-end of your website.
The image version to use for the thumbnail. Choose "original size" to use the Slide's main background and simply rezize it, or choose "From Slider Settings" to use the Module's default image size version instead.