自定义 FCM 通知声音不起作用

Question

我正在构建一个 React Native 应用程序，并且我正在使用内置 c# 的服务器端应用程序在我的应用程序处于后台时向它发送通知。通知工作正常，但是当我添加声音参数时，自定义声音不起作用。我在 /res/raw 文件夹中添加了一个 sound.mp3 文件，并在我的负载中引用了该名称。知道我哪里出错了吗？提前致谢。

c# 代码

static void sendRequest(string fcmtoken, Dictionary<string, object> usdetails, string chatdocid,string userdocid,string reqtype,int time)
{
    WebRequest tRequest = WebRequest.Create("https://fcm.googleapis.com/fcm/send");
    tRequest.Method = "post";
    //serverKey - Key from Firebase cloud messaging server  
    tRequest.Headers.Add(string.Format("Authorization: key={0}", ""));
    //Sender Id - From firebase project setting  
    tRequest.Headers.Add(string.Format("Sender: id={0}", ""));
    tRequest.ContentType = "application/json";
      var  payload = new
      {
            to = fcmtoken,
            priority = "high",
            content_available = true,
            notification = new
            {
                body = "You have a new chat request from " + usdetails["Name"].ToString(),
                title = "New Chat Request",
                badge = 1,
                sound= "sound.mp3"
            },
            data = new
            {
                type = "chat",
                chatdoc = chatdocid,
                name = usdetails["Name"],
                photo = usdetails["photopath"],
                userdocid
            }

        };
    
    string postbody = JsonConvert.SerializeObject(payload).ToString();
    Byte[] byteArray = Encoding.UTF8.GetBytes(postbody);
    tRequest.ContentLength = byteArray.Length;
    using (Stream dataStream = tRequest.GetRequestStream())
    {
        dataStream.Write(byteArray, 0, byteArray.Length);
        using (WebResponse tResponse = tRequest.GetResponse())
        {
            using (Stream dataStreamResponse = tResponse.GetResponseStream())
            {
                if (dataStreamResponse != null) using (StreamReader tReader = new StreamReader(dataStreamResponse))
                    {
                        String sResponseFromServer = tReader.ReadToEnd();
                        //result.Response = sResponseFromServer;
                    }
            }
        }
    }
}