uploading class - change upload data array

Hi

PHP Code:

$this->upload->data(); 


After upload, i check the file width, if it is more than 500, then i resize it. 

PHP Code:

if($this->image_lib->resize()) {
$this->upload->data()['file_name'] = $this->upload->data()['raw_name']."_thumb.".$this->upload->data()['file_ext'];
}

return $this->upload->data(); 


But it is not chaning the file name. So i am getting upload data. If there is a resize, how to change or get the resized file properties?