Yes indeed, it works if I don’t use the advanced layout builder.
But I would like to use it, so regarding the post_meta_infos.php file: where should I upload it on my server? At the root? In the wp-includes folder? Somewhere else?…
And once uploaded, should I just reload the admin page? And will it be a new icon in the “content elements”?
Thanks

Jordan, you’re the best!
It works fine, thanks a lot for your help!
Have a great day,
Didier