Sophia here from Shopify. The steps to fulfill dropshipping orders with AliExpress may differ depending on which app you're using to import products to Shopify.
If you're using the Oberlo app, I recommend following the step-by-step instructions on fulfilling orders from the Oberlo Help Center. Please let me know if you have any questions about those steps and I'd be happy to help.
If instead you're using a different app to import AliExpress products, I would advise contacting the app developer, but let me know which app it is and I'll see if I can find some more information for you. I look forward to hearing from you!
Okay, cool. Thanks for letting me know!
I took a look at the Shopify App Store page for AliExpress Dropshipping Master, and found a link to the developer's website where they have a guide on fulfilling orders: How to place orders via Dropshipman.
Essentially, whether an order is marked as Unfulfilled in your Shopify admin or you've selected "Request fulfillment", the order should be pushed to the AliExpress Dropshipping Master app. To fulfill the order, head to Apps > DropShipMan (the AliExpress Dropshipping Master app) and click the "Order product" button for each order that needs to be fulfilled.
The instructions on the developer's website include screenshots to guide you through the process, and you can contact them at email@example.com if you have any questions.