Plain Clothing Store review for Shop

I have been running e-commerce stores for some time now. I really love the premise of the SHOP app. I think it has a lot of potential to assist in order tracking and convenience for customers that order with ecommerce shops. However, I am having a large problem with SHOP in how it does not synch well with orders placed at one of my dropship sites. SHOP does not follow tracking of other carriers, and seems to only follow with USPS. This is causing a customer service nightmare with one of my stores. If we are misusing this app please (developers) comment, and we will happily change our review. Cainiao order tracking (for example) does not function.