why does the httpCode in my code not work until it's finished

Question

I wish the result to be a success. But what is produced does not enter into the if and else blocks

public async Task<UploadServicesResult> HandleFileUpload(FileInfo file, string path)
{
    var fileupload = new StreamContent(new FileStream(file.FullName, FileMode.Open));
    multipartContent.Add(fileupload, "file", file.Name);
    multipartContent.Add(new StringContent(path), "folder");
    multipartContent.Add(new StringContent(s3key), "api_key");

    using (HttpResponseMessage response = await httpClient.PostAsync(server, multipartContent))
    {
        if (response.IsSuccessStatusCode)
        {
            string responseBody = await response.Content.ReadAsStringAsync();
            var messageObj = JsonConvert.DeserializeObject<JObject>(responseBody);
            string url = messageObj.Value<string>("url");

            return new UploadServicesResult { IsSuccess = true, Message = url };
        }
        else
        {
            return new UploadServicesResult { IsSuccess = false, Message = "Upload failed" };
        }
    }
}