Francisco GP (crishnakh)

When the plugin ACF or ACF Pro 5.6.0 is active the native WordPress Custom Fields on post, pages or CPTs is not visible and gone missing. If you disable the ACF plugin the custom fields are visible again.
The functionality to hide the WordPress custom fields was introduced in ACF version 5.5.13 but then made default in 5.6.0, it was made default to speed up the page speed load of the admin edit page/post screen.
This plugin reverse this behaviour, so you don’t need to edit the function.php of your template.

Custom Fields Missing When ACF is Active

Reverse missing Wordpress custom fields when ACF is activated.

Archivarix

Archivarix External Images Importer will scan your posts and pages for external urls in src/srcset attribute for all img tags. Based on configured settings it can:
<ul>
<li>Download images from their external locations</li>
<li>Download images from Internet Archive (Wayback Machine)</li>
</ul>
You can choose what to do with images that could not be retrieved from external sources.
For further information and instructions please see <a href="https://archivarix.com/en/wordpress/" rel="nofollow ugc">Archivarix WP Plugin</a>

Archivarix External Images Importer

Works great!
I imported several posts into a site running WordPress 5.9.3 with Gutenberg and the Archivarix External Images Importer plugin imported the external images without any issues. I've tested a few other image importer plugins but none of them had the ability to scan a site and import from existing content like this one does.

Works with Gutenberg

Import external images in posts and pages from its original external sources or Web Archive if original source is unavailable.

Custom Fields Missing When ACF is Active vs Archivarix External Images Importer