save FileStream with www.movie doesn't work very well for Resources.load

I tried to download a www.movie to Resources folder, then I can play later.The file was already download,but didn't appear on Resources.it was appeared after I hit th console window.Somebody can help me.The code like this.

 using UnityEngine;
 using System.Collections;
 using System.IO;
 
 public class moviePlayScript : MonoBehaviour {
 
 
     private string videoFile;
     public GUITexture ttt;
     public WWW www;
     public MovieTexture m1;
     void Start()
     {
         videoFile = Application.dataPath + "/StreamingAssets/Resources/sample.ogg";
         print (videoFile);
 
     }
 
 
 
     IEnumerator DownloadAndPlayVideo() 
     {
 
         if(System.IO.File.Exists(videoFile))
         {        
             print ("find");
          m1 = Resources.Load("sample") as MovieTexture;
             if(m1!=null && !m1.isPlaying && m1.isReadyToPlay)
             {
             ttt.texture = m1;
             m1.Play();
             audio.clip = m1.audioClip;
             audio.Play();
             }
             yield return null;
         }
         else{
             string playVideoFile = videoFile;//for pc
              www = new WWW("http://www.unity3d.com/webplayers/Movie/sample.ogg");
             if(!www.isDone )
                 print( "Download Progress: " + 100*www.progress + "% ..." );
                 yield return www;
 
          if (www != null && www.isDone && www.error == null) 
             {
             FileStream stream = new FileStream(videoFile, FileMode.Create);
             stream.Write(www.bytes, 0, www.bytes.Length);
             print ("stream");
             
             stream.Flush();
             stream.Close();
             m1 = www.movie;
 
             if(!m1.isPlaying && m1.isReadyToPlay)
             {
             ttt.texture = m1;
             m1.Play();
                 audio.clip = m1.audioClip;
                 audio.Play();
             }
             yield break;
             }
 
         print (playVideoFile);
         }
     }
 
 
     void OnGUI()
     {
         if(GUI.Button(new Rect(0,0,100,90), "StartPlay"))
         {
             StartCoroutine(DownloadAndPlayVideo());
         }
         if(GUI.Button(new Rect(200,0,100,90), "StopPlay"))
         {
             StopCoroutine("DownloadAndPlayVideo");
             m1.Stop();
         }
 
 
     }
 
 
 }