UrlManager::getFileUrlTemplate

public function getFileUrlTemplate(int $typeId, int $itemId, string $fieldName): string
{
	$uri = BitrixMainEngineUrlManager::getInstance()->create('rpa.item.getfile', [
		'typeId' => $typeId,
		'id' => $itemId,
		'fieldName' => $fieldName,
	]);

	return ($uri->getUri() . '&file_id=#file_id#');
}