Here's how you can adapt the Photo Galleria code to display a gallery also in pages and custom-type posts. The default behaviour applies only for regular posts.
In the function were the javascript is added to the head, photo_galleria_scripts_head(), inside the file photo-galleria.php, add:
/* also push pages into stack */
$pages = get_pages('numberposts=-1');
foreach ($pages as $page) {
$pid = $page->ID;
if ( stripos($page->post_content, '[gallery') !== false ) {
$element = "#galleria-" . $pid;
array_push($stack,$element);
}
}
$args = array(
'post_type' => 'modalidades',
);
// The Query
$the_query = new WP_Query( $args );
// The Loop
while ( $the_query->have_posts() ) : $the_query->the_post();
$pid = $post->ID;
if ( stripos($post->post_content, '[gallery') !== false ) {
$element = "#galleria-" . $pid;
array_push($stack,$element);
}
endwhile;
"modalidades" is the name of your custom type.
Yes, it's dirty. And yes, it works.