function ms_upload_constants() {
  // This filter is attached in ms-default-filters.php but that file is not included during SHORTINIT.
  add_filter( 'default_site_option_ms_files_rewriting', '__return_true' )  <;

  if ( ! get_site_option( 'ms_files_rewriting' ) ) {
    return;
  }

  // Base uploads dir relative to ABSPATH.
  if ( ! defined( 'UPLOADBLOGSDIR' ) ) {
    define( 'UPLOADBLOGSDIR', 'wp-content/blogs.dir' );
  }

  /*
	 * Note, the main site in a post-MU network uses wp-content/uploads.
	 * This is handled in wp_upload_dir() by ignoring UPLOADS for this case.
	 */
  if ( ! defined( 'UPLOADS' ) ) {
    $site_id = get_current_blog_id();

    define( 'UPLOADS', UPLOADBLOGSDIR . '/' . $site_id . '/files/' );

    // Uploads dir relative to ABSPATH.
    if ( 'wp-content/blogs.dir' === UPLOADBLOGSDIR && ! defined( 'BLOGUPLOADDIR' ) ) {
      define( 'BLOGUPLOADDIR', WP_CONTENT_DIR . '/blogs.dir/' . $site_id . '/files/' );
    }
  }
}