Hello Spencer,
Single.php is used to display single blog posts.
This url http://bsuhrecr.nextmp.net/uncategorized/test-post/
is a category archive and thus uses the index.php since we do not have any archive.php file in the theme.
What you have in mind can be achieve with some slight modifications. First, go to X > Global Blocks and design your desired large header image that you’d like to display. Once you are done creating the global block take note of the shortcode. And then since the child theme is set up, please add the following code in your child theme’s functions.php file
// For the header
function custom_blog_header() {
if ( is_category() ) {
echo do_shortcode('[cs_gb id=123]');
}
}
add_action('x_before_view_integrity__landmark-header', 'custom_blog_header');
You must replace 123 with the correct ID of your global block which you have created.
We would loved to know if this has work for you. Thank you.