Apparel by Ivan review for Printify: Print on Demand

We like the products, but the app integration NEEDS to be improved. We added a bunch of products from a couple different print on demands providers, one of them being Printify. We made edits to the products directly on Shopify after they were added to our store. The other print on demand provider handled our orders exactly right and the integration with Shopify worked perfectly (correct items, shipping notifications to customers, etc). Printify, however, had everything messed up! I had to manually change every single order. Shipping notifications did not get sent to customers, and I now have a bunch of orders that think they haven't been fulfilled even though when I look at the order on Printify, it says delivered or in transit. This has been an absolute nightmare. My guess is the reason is that we're supposed to edit products within Printify before pushing them into Shopify, rather than editing after they've already been pushed into Shopify. But the other POD provider handled everything correctly, so why couldn't Printify?