I'm trying to add Multiple Post Thumnails to a Product post type. I am using Marketpress by WPMU DEV and I cannot get the post thumbnail meta boxes to show up for products.
It seems that the script never calls the
public function thumbnail_meta_box() defined on line 102. I tried adding a echo "test"inside that function and it never gets called.
It's weird because it works fine with my other custom post types.