php - cakephp 2.0 upload file using jQuery Ajax with parameters - still can't get any answer

I am still can't get any answer of this question. Could any one help me out this issue.

I am trying to send an email with attachment to select person. So, I have filtered the data from database and send email with attachment to selected users.

I have gone through the below answer:

How can I upload files asynchronously?

I have tried the below code of JQuery, Ajax, Controller Action:

<script type="text/javascript">
function SendEmail(){
  var checked=0;
  jQuery("#action_row").val('delete');
  var filename = jQuery("#UserPdf").val();
  var audits    =   '';
  $('.checkboxes:checked').each(function(){
     checked=1;         
     audits +=  this.value+',';  
  });
 var auditsval  =   audits.slice(0, -1);
  //alert(auditsval);
  if(checked==1){
      var con   =   confirm('Are you sure you want to send email?');
      if(con){
          jQuery.ajax({
            type: "POST",
            url: CommanPath.basePath+'admin/users/send_email',
            enctype: 'multipart/form-data',
            data: {
                file: filename,
                ids: auditsval,
            },
            success: function (data) {
                alert("Email sent to selected users ");
            }
        });
      }

  }else{
    alert("Please select atleast one to send email");  
  }

}
</script>
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UsersCOntroller.php

public function admin_send_email($id = null){
    //echo 'here'; die;

    $this->layout = 'ajax';
    echo '<pre>'; print_r($_FILES); die;

    if(isset($this->params['data']['file']) && $this->params['data']['file']){

        $filename = time().$this->params['data']['file'];
        move_uploaded_file($_FILES['data']['tmp_name']['file']['name'], WWW_ROOT.'uploads/sellingtools/' . $filename);
    }
    $userids = explode(",", $this->params['data']['ids']);
    echo '<pre>'; print_r($userids); die;
}
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When I am trying to get uploaded file name, I am getting only file name not getting thetmp_name.

Anyone can let me know how I can get thetmp_name and move file to exact path.

Please help.