Hello,
Not all cards have First Aid content so you will not see FA HTML on all cards
We do not sync FA images due to copyright, please see this post for more info: Why don't I have all the media in the AnKing Step Deck?
You also unprotected the Physeo field which is most likely accounting for most of your missing media and images. You can only get Physeo images if you have an active Physeo subscription. They provide the media folder on their website