Thanks for the request, however the “Insert into post” button is not relevant to this field type, as the gallery field is a very custom interface and would not comply with the_editor. Also, what if the user does not have the_editor in their post_type?
As for the set as featured image. I would have thought this would be a link already available for each image in the sidebar information.
Okay, but a technical question here. How can I add more buttons into the Gallery field media frame toolbar? I know it uses the default select toolbar, but whenever I try to add some buttons, it only works for builtin Media frames (button “Insert media”)
If you could help me add a button into that toolbar I can conclude this question.
ACF image popup or gallery doesnt set a toolbar, but WP core fallback/default toolbar is “select”. My understanding here is that I would either need to create a separate toolbar or use some of the existing ones (for example the “select” one it already uses) but we miss some handlers for new buttons here.