How to load file from local NAS ( Windows and Android )

Hello

I try to read files from a my NAS. In my configuration, i have a shared folder on a Nas at @ \\sebkkun-nas/mcp_files. A mapped a network drive on it on R:\ ( for test purpose ) using chrome I can access file:///sebkkun-nas/mcp_files/TestFichier.txt, so URL is cocrect. But it doesn't work in Unity. file:///R:/TestFichier.txt : works in unity https://upload.wikimedia.org/wikipedia/hu/8/8c/Krillin_dragon_ball_anime.png, also works.

What am I missing ?

My code :

     IEnumerator WaitForRequest(WWW www)
     {
         yield return www;
         if (www.error == null)
             Debug.Log("WWW Ok!: " + www.text);
         else
             Debug.Log("WWW Error: " + www.error);
     }
 
     void Start () 
     {
         string url;
         url = "file:///sebkkun-nas/mcp_files/TestFichier.txt"; // Does NOT WORK
         url = "file:///R:/TestFichier.txt"; // OK 
         url = "https://upload.wikimedia.org/wikipedia/hu/8/8c/Krillin_dragon_ball_anime.png"; // OK 
         var myFile = new WWW(url);
 
         StartCoroutine(WaitForRequest(myFile));