amazon s3 - Cannot load more than 2 files to S3 using plupload -

my code below works fine long load 2 multiple files. if load 3 or more, every file after 2nd 1 not added s3 bucket (although no error shown plupload).

can understand why?

     var uploader = new plupload.uploader({      browse_button: 'browse', // can id of dom element or dom element      url: 'https://s3.amazonaws.com/mybucket',      filters: {          max_file_size: '25mb',          prevent_duplicates: true,          multiple_queues: true      }  });   uploader.init();   uploader.bind('filesadded', function (up, files) {      plupload.each(files, function (file) {           var myfilename = file.name.tolowercase();          myfilename = myfilename.replace(/[|&;$%@"<>()+,]/g, "");           var elem = $('#hfreplyguid');                $.ajax({                  type: "post",                  contenttype: "application/json; charset=utf-8",                  datatype: "json",                  url: "webservice.asmx/prepareupload",                  data: "{'acl':'private','bucket':'mybucket','file':'" + folderpath + elem.val() + "_" + myfilename + "'}",                  success: function (data) {                      params[myfilename] = { policy: data.d[0].policy, signature: data.d[0].signature };                       var multipart_params = {                          'key': folderpath + elem.val() + "_" + myfilename,                          'filename': folderpath + elem.val() + "_" + myfilename,                          'awsaccesskeyid': awsaccesskey,                          'acl': 'private',                          'signature': params[myfilename]["signature"],                          'policy': params[myfilename]["policy"],                          'success_action_status': '201'                      }                        up.setoption('multipart_params', multipart_params);                       uploader.start();                  },                  error: function (xhr, ajaxoptions, thrownerror) {                      alert(xhr.status);                      alert(xhr.responsetext);                      alert(thrownerror);                  }              });       });  }); 

i solved basing code on post upload multiple files amazon s3 using plupload

however had create policies in filefiltered event, start uploader in filesadded event , add each policy in beforeupload event below:

       var multipart_params = policies[file.id];        up.setoption('multipart_params', multipart_params);