WordPress at a glance
action is not described

wp_edit_form_attachment_display action-hook . WP 4.6.0

Fires when an attachment type can't be rendered in the edit form.

Usage

add_action( 'wp_edit_form_attachment_display', 'action_function_name_8395' );
function action_function_name_8395( $post ){
	// action...
}
$post(WP_Post)
A post object.

Where the hook is called

media_upload_type_form()
wp-admin/includes/media.php 2802
do_action( 'wp_edit_form_attachment_display', $post );

Where the hook is used (in WP core)

Does not used.