/**
  * Array for multiple upload
  *
  * @param \In2code\Powermail\Domain\Model\Field $field
  * @param \array $additionalAttributes To add further attributes
  * @return array
  */
 public function render(\In2code\Powermail\Domain\Model\Field $field, $additionalAttributes = array())
 {
     if ($field->getMultiselectForField()) {
         $additionalAttributes['multiple'] = 'multiple';
     }
     if (!empty($this->settings['misc']['file']['extension'])) {
         $additionalAttributes['accept'] = $this->getDottedListOfExtensions($this->settings['misc']['file']['extension']);
     }
     return $additionalAttributes;
 }