WWWForm.AddBinaryData() clears post and file data.

I'm making an online leaderboard and I need to be able to upload a file to be saved with the scores as well so I am using WWWForm to make a post request using AddField for the score data and AddBinaryData for the file. The request work fine without AddBinaryData but as soon as I use AddBinaryData all my post variables are gone and no files are uploaded.

         WWWForm form = new WWWForm();
         form.AddField("name", WWW.EscapeURL(name));
         form.AddField("score", score);
 
         string loadPath = Application.persistentDataPath + "/file.ext";
 
         if (File.Exists(loadPath))
         {
             FileStream stream = new FileStream(loadPath, FileMode.Open, FileAccess.Read, FileShare.Read);
             BinaryReader reader = new BinaryReader(stream);
             form.AddBinaryData("file", reader.ReadBytes((int)reader.BaseStream.Length)); // 1
             stream.Close();
         }
         WWW post = new WWW(url, form);

If I comment out the AddBinaryData line the data used by my php script is :

 $_POST Array
 (
     [name] => NAME
     [score] => 99999
 )
 $_FILES Array
 (
 )

Just by uncommenting the AddBinaryData line and doing nothing else, the data is:

 $_POST Array
 (
 )
 $FILES Array
 (
 )

I need to figure this out ASAP, Thanks for the help.