title: open multiple images from one thumbnail in custom wordpress gallery
body: <p>I made a custom gallery option for my theme using Advanced Custom Fields Plugin for WP. It lets the user upload images to a custom page which on clicking opens a lightbox to show the full-sized image. What I want to do now is open a gallery of images using just one thumbnail. The only thumbnail showing on the page will be one that gives the user an idea of what is inside.Any help would be appreciated.</p>