title: Unity Add mp3 file from persistentDataPath
body: <p>need your help with turn on mp3 file(with wav and ogg file all is ok) from persistentDataPath in Unity.
  I have this code to find audio file in persistentDataPath and turn on as AudioClip</p>
  
  <pre><code>public void StartAudio()
  {
      StartCoroutine(PlayAudioClip());
  }
  
  IEnumerator PlayAudioClip()
  {
      UnityWebRequest www = UnityWebRequestMultimedia.GetAudioClip(Application.persistentDataPath + "/" + "_song", AudioType.MPEG);
      yield return www.Send();
      //WWW testrequest = new WWW(Application.persistentDataPath + "/" + "_song.mp3");
      if (www.isNetworkError)
          Debug.Log("play error: " + www.error);
      else
      {
          AudioClip audioTrack = DownloadHandlerAudioClip.GetContent(www);
          audio.clip = audioTrack;
          audio.Play();
      }
  }
  </code></pre>
  
  <p>But when I tried to turn on mp3 file I had this error</p>
  
  <blockquote>
    <p>Streaming of 'mpeg' on this platform is not supported<br>
    UnityEngine.Networking.DownloadHandlerAudioClip:GetContent(UnityWebRequest)</p>
  </blockquote>