Hello,
Thank you for contacting Rank Math and bringing your concern to our attention. I’m sorry for the delay.
I’m not quite sure whether I fully understand your concern. But I’ll do my best, and please let me know if I misunderstood.
To summarize, the video and image gallery in your post has a feature in which you can input meta descriptions and keywords separately. Could you please confirm?
You can also share your post’s URL in the sensitive data section for us to check further.

It is completely secure, and only our support staff has access to that section.
Looking forward to helping you.
Thank you.
Hello,
I have updated the sensitive data as requested. Can you please check further?
Thank you.
Hello,
Thank you for getting back to us.
For this case am assuming the gallery and the video make up the post content here. You need to do the SEO of the post since this is what search engines see.
The post SEO here should relate to your content which is the video and gallery content. Simply provide a description or SEO meta that is relevant to your content.
Also, consider doing individual SEO for the images here.
Therefore if it is the heading, use a heading for all three as you suggest in the first case.
Hope this helps. Please let us know if you need more assistance.
Thanks for your help, much appreciated.
Hello,
Glad that this resolved your issue. If you have any other questions in the future, know that we are here to help you.
If you don’t mind me asking, could you please leave us a review (if you haven’t already) on https://wordpress.org/support/plugin/seo-by-rank-math/reviews/#new-post about your overall experience with Rank Math? We appreciate your time and patience.
If you do have another question in the future, please feel free to create a new forum topic, and it will be our pleasure to assist you again.
Thank you.