Embed PDF on LMS article

ERPNext Education
1

Hi, is there a way to embed PDF on article doctype for LMS? Or embed it as suggested here How to embed a PDF in HTML without the ability to download

<html>
  <head>
<title>Example on how to embed Google Drive PDF inside website</title>
<meta charset="UTF-8" />
  </head>
  <body>
<div id="app">
  <iframe
    src="https://drive.google.com/file/d/1kJJeabYl-NH4nsNV8kLs-qTUYESbUfMx/preview"
    width="500"
    height="375"
  >
  </iframe>
</div>
  </body>
</html>

Adding html editor on article doctype does not allow me to show html generated page, let alone embed a PDF.

iframe tag also removed, writing </iframe> will become &lt;/iframe&gt;