I'm building a site using Upfront. I am trying to design my own child theme. I would like to have an image at the top be full width AND the option to use it or another image in posts as the featured image, differing for each post. Right now I have a generic layout I'm building and included the full width, parallax image at the top. But I'm not seeing how to make it an option for this to be the featured image. Is this not possible? Or do I need to add the image another way?
I've opened the site to support. Thanks.