Meta Box

Hi Anh,

The test code is below.

$meta_boxes[] = array (
    'title' => esc_html__( 'test', 'text-domain' ),
    'id' => 'test',
    'post_types' => array(
        0 => 'post',
    ),
    'context' => 'normal',
    'priority' => 'high',
    'fields' => array(
        array (
            'id' => $prefix . 'group_test',
            'type' => 'group',
            'name' => esc_html__( 'Group', 'text-domain' ),
            'fields' => array(
                array (
                    'id' => $prefix . 'test1',
                    'type' => 'file_advanced',
                    'name' => esc_html__( 'File Advanced', 'text-domain' ),
                    'max_file_uploads' => 1,
                    'max_status' => false,
                    'clone' => 1,
                    'sort_clone' => 1,
                ),
            ),
            'clone' => 1,
            'sort_clone' => 1,
            'default_state' => 'expanded',
        ),
    ),
);

return $meta_boxes;

Thanks and Regards,
Yumikom

Hi Anh,

I'm thankful for your quick debugging.
When I was save post again, I could confirm that post type select field array value is emptied.