C# Post yaparken istenilen değeri göndermiyor

        static readonly HttpClient client = new HttpClient();
        public static string path = @"C:\Users\***\Downloads\steam.jpg";
        const string api = "api/upload/";
        public static async Task<bool> Upload()
        {

            using MultipartFormDataContent multipartContent = new();
            var imageContent = new StreamContent(File.OpenRead(path));
            imageContent.Headers.ContentType = MediaTypeHeaderValue.Parse(MediaTypeNames.Image.Jpeg);
            StringContent str = new StringContent("type".ToString());
            multipartContent.Add(str, "test");
            multipartContent.Add(imageContent, "file", Path.GetFileName(path));
            using var response = await client.PostAsync(api, multipartContent);
            string message = await response.Content.ReadAsStringAsync();
            MessageBox.Show(message);
            return true;
        }

            if (isset($_FILES["file"])  && isset($_POST["type"])){
                $type = $_POST["type"];
                $file = $_FILES["file"];
                var_dump($type);
                var_dump($file);
            }

if($_SERVER['REQUEST_METHOD'] == "POST") {          
        if (isset($_FILES["file"])  && isset($_POST["type"])){
                $type = $_POST["type"];
                if(isset($type)){
                    $uploadresult = uploadImage(1, $type, $_FILES["file"]);
                    if($uploadresult){
                        JsonBuild(200, TRUE, "Başarıyla yüklendi!");
                    }
                    else{
                        JsonBuild(400, TRUE, "Dosya yüklenemedi!");
                    }
                }
                else{
                    echo $type;
                }
                }

if ($_POST){
   
}

        public static async Task<bool> Upload(string path, string type){

                using (var multipartFormDataContent = new MultipartFormDataContent())
                {
                    var values = new[]
                    {
                        new KeyValuePair<string, string>("type", type),

                    };

                    foreach (var keyValuePair in values)
                    {
                        multipartFormDataContent.Add(new StringContent(keyValuePair.Value),
                            String.Format("\"{0}\"", keyValuePair.Key));
                    }
                    var imageContent = new StreamContent(File.OpenRead(path));
                    imageContent.Headers.ContentType = MediaTypeHeaderValue.Parse(MediaTypeNames.Image.Jpeg);
                    multipartFormDataContent.Add(imageContent, "file", Path.GetFileName(path));

                    var result = client.PostAsync(api, multipartFormDataContent).Result;
                    await result.Content.ReadAsStringAsync();
                    return true;
                }
            }