Display a custom post type's media library inline on the WordPress edit page screen

wordpress_custom_post_gallery.php

<?php
 
  define('MY_POST_TYPE', 'my');
  define('MY_POST_SLUG', 'gallery');

  function my_register_post_type () {
  	$args = array (
  		'label' => 'Gallery',
  		'supports' => array( 'title', 'excerpt' ),
  		'register_meta_box_cb' => 'my_meta_box_cb',
  		'show_ui' => true,
  		'query_var' => true
  	);
  	register_post_type( MY_POST_TYPE , $args );
  }
  add_action( 'init', 'my_register_post_type' );

  function my_meta_box_cb () {
  	add_meta_box( MY_POST_TYPE . '_details' , 'Media Library', 'my_meta_box_details', MY_POST_TYPE, 'normal', 'high' );
  }

  function my_meta_box_details () {
  	global $post;
    $post_ID = $post->ID; // global used by get_upload_iframe_src
  	printf( "<iframe frameborder='0' src=' %s ' style='width: 100%%; height: 400px;'> </iframe>", get_upload_iframe_src('media') );
  }

Thanks - I was banging my head against a brick wall - I've been using WPAllImport to load images into the gallery but could not get the gallery editor to appear. Your code above, integrated into my own custom post type, solved my problem.

That's great! but.... how can I show render it in template? Thank for answer

Thanks!

Try using
var_dump( get_attached_media( 'image' ));
inside the post area. You will get some idea :-)

Damn, this guy is genius

Sounds great. Where do I paste this code?