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  //store file in file_managed
  $file_recce = new stdClass;
  $file_recce->uid = 1;
  $file_recce->uri = 'public://mp/' . $pdf_name;
  $file_recce->filemime = 'application/octet-stream';
  $file_recce->filename = $pdf_name;
  $file_recce = file_save($file_recce);