When I use AfterShip and OmniSend, both apps allow me link to products/collections from my shop, but they show the domain as the Shopify name (when you mouseover), and NOT the domain I have purchased and linked and set as default.
So it’s not broken in that it redirects correctly, but anyone with a keen eye will see “shopname.shopify.com” preceding the product or collection in the hover url
Is this something that can be easily sorted out?