The problem is that Galleria Galleria uses the output of the default WordPress [gallery] and that doesn’t support the image link URL option. I do have somewhat of a hack you can use to get around this. If you download the latest beta version of the plugin, you can add a hook to modify the galleria settings. With that hook, you can tell galleria to use the image’s caption as the image link instead of the link URL by placing this code in your theme’s functions.php:
function my_galleria_options() {
return "data_config: function(img) {
// will extract and return image titles and links from the source:
return {
title: $(img).attr('title'),
description: '',
link: $(img).parents('.gallery-item').find('.gallery-caption').text(),
};
}";
}
add_filter('galleria_galleria_theme_options', 'my_galleria_options');