req_uri: /ntu-ocw/cou-file/104S101/104S101_CT05L01.pptx?preview=1 <br>dir - fn: 104S101 - 104S101_CT05L01.pptx <br>/var/www/html/ocw_files<br>fp: /var/www/html/ocw_files/104S101/104S101_CT05L01.pptx <br><pre>array(4) {
  ["dirname"]=>
  string(31) "/var/www/html/ocw_files/104S101"
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</pre>pv_fp: /var/www/html/ocw_preview/104S101/104S101_CT05L01.pptx.pdf <br>Conversion failed