Any update on this?
These custom attachment meta fields are being displayed properly (line #357 of /pro/fields/gallery.php)
However without the fix I outlined above, changes to custom meta fields are never saved to the database.
If ACF isn’t going to properly save the data from these fields, then they shouldn’t be displayed to begin with. But obviously the better solution is simply to call the ‘attachment_fields_to_save’ filter as I outlined above.
I have this working on a project however until this fix gets included into ACF it will be overwritten with every new update.
