I have tried two different solutions for Aliexpress invoices, but AliInvoice has more useful features than any others.
Using Ali Invoice, you can generate an invoice in a single click, for every order you have ever placed on AliExpress! One more click and you can print it or save it as PDF.
AliInvoice Extension Download - They have promotion now:
You can get period license or a lifetime license.
There is also Free plan available so you can try it first.
This is the best solution at the moment.