Router::getFileUrl

public function getFileUrl(int $entityTypeId, int $id, string $fieldName, int $fileId): Uri
{
	return new ContentUri(\Bitrix\Main\Engine\UrlManager::getInstance()->create('crm.controller.item.getFile', [
		'entityTypeId' => $entityTypeId,
		'id' => $id,
		'fieldName' => $fieldName,
		'fileId' => $fileId,
	], true));
}