WordPress at a glance
function is not described

media_upload_gallery() WP 2.5.0

Retrieves the legacy media uploader form in an iframe.

No Hooks.

Return

String/null.

Usage

media_upload_gallery();

Code of media upload gallery: wp-admin/includes/media.php VER 5.0.3

<?php
function media_upload_gallery() {
	$errors = array();

	if ( !empty($_POST) ) {
		$return = media_upload_form_handler();

		if ( is_string($return) )
			return $return;
		if ( is_array($return) )
			$errors = $return;
	}

	wp_enqueue_script('admin-gallery');
	return wp_iframe( 'media_upload_gallery_form', $errors );
}