CheckList::addAttachments

public function addAttachments($filesIds)
{
	foreach ($filesIds as $id)
	{
		$id = ($id[0] === 'n'? $id : 'n'.$id);
		$attachments = $this->fields->getAttachments();

		if (!in_array($id, $attachments, true))
		{
			$this->fields->addAttachment($id);
		}
	}
}