Duplicate images from the post to the gallery

– WordPress 3.6.1
– NextGEN 2.0.31

Hello.
I need some help, with automatically duplicate images that are added to post – to NextGen Gallery.
I used plugin – “Multi Image Metabox” – this plugin adds metaboxes into my custom post types.
The function to save this images –

$list_images = list_my_images_slots();
    foreach($list_images as $k => $i){
	    if ( isset( $_POST[$k] ) ) {
			check_admin_referer('image-liee-save_'.$_POST['post_ID'], 'image-liee-nonce');
			update_post_meta($post_ID, $i, esc_html($_POST[$k]));
		}
	}

So the question is, what function I can automatically add these photos to the gallery of the same name as the category of this post?

https://www.ads-software.com/plugins/nextgen-gallery/