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ACF field not displaying on index.php generated pages in Twenty Seventeen theme

Solution:

From the docs https://www.advancedcustomfields.com/resources/value-loading-posts-page/. I’m assuming you’ve set it up to return the URL of the image.

<?php 
$imageUrl = get_field('image-head', get_option('page_for_posts'));

if( !empty($imageUrl) ): ?>

    <img src="<?php echo $imageUrl;?>" />

<?php endif; ?>

The Query on the index page is the blog posts not the page so you have to specifically tell ACF that you want the field from the page (same goes for other archive pages).