Not detecting headings and rich media

Hello,

Thank you for contacting Rank Math and bringing your concern to our attention. I’m sorry for the delay and for any inconvenience this issue may have caused you.

It seems that the Nicepage plugin is not yet compatible with Rank Math. We have added API access to the content analysis in the Rank Math plugin to make content from page builder plugins readable by Rank Math.

For Rank Math to detect your content using that builder, you would need to contact the developer of the plugin you mentioned by showing the following link:
https://rankmath.com/kb/content-analysis-api/

Many known companies have already added the compatibility, as it takes a few hours:
https://rankmath.com/compatibility/divi/
https://rankmath.com/compatibility/elementor/
https://rankmath.com/compatibility/themify-builder/
https://rankmath.com/compatibility/page-builder-framework/
https://rankmath.com/compatibility/flothemes/

Please note that the tests in Rank Math are only there for your reference to help you in optimizing your pages/post content. If you feel any of them doesn’t apply or you have already done, please feel free to ignore them.

I hope that helps. Thank you, and please don’t hesitate to contact us anytime if you need further assistance.