[HttpPost]
    public async Task<string> UploadFile(string data) {
      dynamic execResult = null;
      TDecryptedCookie cookie = TAuthorization.GetCookieInfo(Request);
      dynamic json = TTools.Deserialize(data);


      string url = $"{TConst.FileServerHost}FileService/Upload?data={{ \"folder\":\"{json.F_Folder.Value}\", \"filename\":\"{json.F_FileName.Value}\",\"personID\":{cookie.PersonID}}}";


      dynamic result;
      var baseAddress = new Uri(url);

      try {
        using (var client = new HttpClient() { BaseAddress = baseAddress }) {
          client.DefaultRequestHeaders.Add("Authorization", Request.Headers["Authorization"].ToString()); 
          using var form = new MultipartFormDataContent();

          foreach (var file in Request.Form.Files) {
            //обработка файла
            byte[] fileBytes;

            using var ms = new MemoryStream();
            file.CopyTo(ms);
            fileBytes = ms.ToArray();
            using var fileContent = new ByteArrayContent(fileBytes);
            form.Add(fileContent, "file", file.FileName);
          }
          using var response = await client.PostAsync(baseAddress, form);   // <====== Error while copying content to a stream.
          response.EnsureSuccessStatusCode();
          var responseContent = await response.Content.ReadAsStringAsync();
          result = await TTools.Deserialize(responseContent);

          
      } catch (Exception e) {
        result = new { result = false, message = e.Message };
      }
      return result;
    }