Unity Android reads the json file and parses it

I encountered a problem when doing pico development, the parsed json data could not be displayed normally. At first I thought that the text could not be obtained, but after trying various methods, I found that the parsing method was wrong. Go directly to the code ↓

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class DeviceData : MonoBehaviour
{
    private void InitData()
    {
        //json文本放到streamingAssets文件夹里
        StartCoroutine(WWW_Tex(Application.streamingAssetsPath + "/Config.txt"));
    }
    IEnumerator WWW_Tex(string url)
    {
        WWW www = new WWW(url);
        yield return www;
        if (www.isDone && www.error == null)
        {
            string str = www.text;
            //使用unity自带的json解析方式，Newtonsoft.Json在安卓端不支持
            Devices ds = JsonUtility.FromJson<Devices>(str);
            foreach(DeviceInfo info in ds.devices)
            {
                deviceDic.Add(info.Name, info.Des);
            }
        }
    }
}