I have taken over a site from someone.
He has a list of businesses on the site, each one has a URL, saved as a field:

$iframe_url = get_field(‘manufacturer_url’);

It seems he used to manage this URL on a custom post-type page, but the actual field to edit the URL has disappeared – maybe in some recent WordPress update.

I have made sure on the edit page, all the elements are checked off on the ‘screen options’ tab. But i still cannot see where this field is, where i can change the URL. Any ideas?

Using Version 5.8.7 of the plugin
WP version: WordPress 5.1.4 running Chameleon-Child theme.