code: public function generateMarkup()
  	{
  		$return = '
    <div>
      <input type="file" name="' . $this->strName . '[]" class="tl_upload_field" onfocus="Backend.getScrollOffset()" multiple required>
    </div>';
  
  		if (isset($GLOBALS['TL_LANG']['tl_files']['fileupload'][1]))
  		{
  			$return .= '
    <p class="tl_help tl_tip">' . sprintf($GLOBALS['TL_LANG']['tl_files']['fileupload'][1], System::getReadableSize(static::getMaxUploadSize()), Config::get('gdMaxImgWidth') . 'x' . Config::get('gdMaxImgHeight')) . '</p>';
  		}
  
  		return $return;
  	}
docs: Generate the markup for the default uploader
  
  @return string