A quick follow up. I was just chatting with some of my more knowledgable peers and they suggested 2 different workarounds:
First up is using a webhook step to pull the URL to the image. Here’s a post from another user who was working through the same thing:
Alternatively, you could manually get the URL of the image from within Wordpress at the time of making the post and add that into a custom field that isn’t displayed on the site. We should be able to see the custom fields on the Zapier side so you’d be able to select the custom field and keep on going!