Iframe in Action Center form HTML Element content

I have added iframe tag in the Content section of the HTML Element from component to display a pdf file.

The pdf file is uploaded to the Storage Bucket and referred in the iframe src attribute.

However, the iframe tag does not render when the form is opened in the Cloud Orchestrator

Did you toggled Refresh on change below the content field?

Yes, I have tried using the Refresh On Change option, but the result is the same, the iframe tag does not render.