How to list post attachments inside a WordPress admin single

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Looking to list post attachments made by Gravity Forms (or other plugins) inside the WordPress admin single? Here’s a guide on how to do it.

Use a metabox to display post attachments

You should use a custom meta box and loop through your post’s attachments using the example below. You can also specify the post type accordingly, should you need this only for a custom post type.

function metabox_view_upload_files() {
     add_meta_box( 'att_thumb_display', 'Files', function( $post ) {
          $args = array(
               'post_type' => 'attachment',
               'post_mime_type' => 'image',
               'post_parent' => $post->ID
          );

     echo '<ul>';
     foreach( get_posts( $args ) as $image) {
          echo '<li><a href="' . wp_get_attachment_url( $image->ID ) . '" target="_blank">' . wp_get_attachment_url( $image->ID ) . '</a></li>';
     }
     echo '</ul>';
     }, 'post' ); // Change your post type here
}

add_action( 'add_meta_boxes', 'metabox_view_upload_files' );