MessengerCallConnector::getLinkFileInChat

protected function getLinkFileInChat(): ?FileLink
{
	$file = $this->getAttachedObject()->getFile();
	$sharings = $file->getSharingsAsReal(['TO_ENTITY' => Sharing::CODE_CHAT . $this->getChatId()]);
	if ($sharings)
	{
		return $sharings[0]->getLinkObject();
	}

	return null;
}