change featured image as article image

Hello,

Right now Instant Articles is using our Featured Image as the main image of the IA in Facebook. I would like to use the following instead of the featured image:
<div class=”post-content single-image”>

We are using a custom field to set this image value, and I know in this post you discussed ACF, https://wordpress.org/support/topic/add-custom-fields-to-instant-article/, but I am afraid I still don’t understand how I would go about changing:

{ 
        "class": "ImageRule", 
        "selector" : "div.wp-caption", 
        "properties" : { 
            "image.url" : { 
                 "type" : "string", 
                 "selector" : "img", 
                 "attribute": "src" 
             }, 
             "image.caption" : { 
                 "type" : "element", 
                 "selector" : "p.wp-caption-text" 
             } 
         } 
      }

Or would I simply add in:
`{
“class”: “ImageRule”,
“selector” : “div.single-image”
}, `

IA is also not capturing any of our other images within the article, it only shows the Featured Image. (e.g., <div id=”attachment_16748″ style=”width: 710px” class=”wp-caption aligncenter”><p class=”wp-caption-text”>)

Is this the same rule I would adjust to display all images within an article?

Thank you in advance,
Donna

• This topic was modified 9 years, 9 months ago by donnytree. Reason: give a more detailed example of image issue