title: Problem with download file on mobile devices
body: <p>why when i try save xlsx file from mobile sites thats return me filename.xlsx.html, but on desktop this work fine</p>
  <pre><code>$xlsSave = new Xls($spreadsheet);
  
  header('ContentType:application/vnd.openxmlformatsofficedocument.spreadsheetml.sheet');
  header('Content-Disposition: attachment; filename=&quot;' . $filename . '.xlsx&quot;');
  
  $xlsSave-&gt;save('php://output');
  </code></pre>