not work with with the custom post type

Not sure what to tell you. Check your code for typos maybe. I know that the filter works because I just used it last week in a client site.

Try removing other plugins to see if there is a conflict.

still having a same issue not using any other plug in when i add this in my theme function.php nothing happen

function add_featured_galleries_to_ctp( $post_types ) {
array_push($post_types, ‘custom_post_type’); // ($post_types comes in as array(‘post’,’page’). If you don’t want FGs on those, you can just return a custom array instead of adding to it. )
return $post_types;
}
add_filter(‘fg_post_types’, ‘add_featured_galleries_to_ctp’ );