How can I generate PDF file or convert .html file from stage file to PDF

Summary:

I want to send notification with pdf attachment, am able to send the attachment with .html file extension but when I try to save the file in stage file in .pdf extension it doesn't open up. Is there any other way to generate .pdf or convert .html to pdf in OIC

Content (required):

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):