Sort Media not working

I am attempting to use this plugin to sort attachments. I think I have done everything needed and it is not working. To “open” attachments to the sort plugin I used the following code, and it is not working. Am I doing it wrong or will this not work with attachments?

function lcs_attachment_args( $args, $post_type ) {
	if ( 'attachment' != $post_type ) {
		return $args;
	}

	return array_merge( $args, array( 'hierarchical' => 1, ) );
}

add_filter( 'register_post_type_args', 'lcs_attachment_args', 1, 2 );

add_post_type_support( 'attachment', 'page-attributes' );