Many WordPress users set only one featured image for each post. In certain cases, it makes sense to add more than one featured image to make your site look more dynamic. The Dynamic Featured Image plugin can help. It lets you set multiple thumbnails for your posts and pages without having to write any code.
The Dynamic Featured Image plugin is ideal to use with sliders and other scripts that need alternative featured images. To get started, install the plugin, click on set featured image link, and then add new featured images from there.