Inventory_Presser_Photo_Numberer::save_meta_photo_number( int $post_id, int $parent_post_id, int $sequence_number = null )
Saves a sequence number like 1, 2, or 99 in attachment post meta. This number dictates the order in which the photos will be disabled in sliders and galleries.
(Required) The post ID of the attachment
(Required) The post ID of the vehicle to which $post_id is a child
(Optional) The sequence number to save. Do not provide to append.
Default value: null