[Unity] partial downloads using UnityWebRequest

IEnumerator PartlyDownload()
    {
        string url = connectionConfig.ImagesNameListEndpoint;

        Debug.Log(Application.persistentDataPath);
        string vidSavePath = Path.Combine(Application.persistentDataPath, "list");
        vidSavePath = Path.Combine(vidSavePath, "MyList.txt");

        //Create Directory if it does not exist
        if (!Directory.Exists(Path.GetDirectoryName(vidSavePath)))
        {
            Directory.CreateDirectory(Path.GetDirectoryName(vidSavePath));
        }

        DownloadHandler downloadHandler = new DownloadHandlerFile(vidSavePath);
        var download = new UnityWebRequest(url, UnityWebRequest.kHttpVerbGET, downloadHandler, null);
        int resumeOffset = 131;
        var rangeHeader = "bytes=" + resumeOffset + "-";
        download.SetRequestHeader("Range", rangeHeader);

        yield return download.SendWebRequest();

        if (download.isNetworkError || download.isHttpError)
            Debug.Log(download.error);
        else
            Debug.Log("Success");

    }