BenBensen

Thanks for the answer. Yeah it’s set to ‘top’.

I assume you have to wrap the result in HTML.

Like this:

<?php if ( get_post_meta( get_the_ID(), 'thumb', true ) ) : ?>
    <a href="<?php the_permalink() ?>" rel="bookmark">
        <img class="thumb" src="<?php echo get_post_meta( get_the_ID(), 'thumb', true ) ?>" alt="<?php the_title(); ?>" />
    </a>
<?php endif; ?>

Source: https://codex.www.ads-software.com/Function_Reference/get_post_meta