For making this cleared, if you do not use Oberlo for importing products, it won’t be able to bulk update AliExpress links for your products by "Sync with Oberlo" feature.
NOTE: Don't forget to login your Oberlo account at the same time.
For the products which are not imported from Oberlo, you have to update the product manually one by one. To do it, please help me to follow this instruction:
Go to AliExpress website, find the original link of a product and copy this link.
Go to Product list > Filter “Unknown source” > Click on “Update now” button for every single product to update the link manually.
Enter product URL (AliExpress product) > Click on "Update" button.
Map variants (if can not auto map).
Should you have any other concern, feel free to let us know via our live chat channel by clicking on the bottom right icon inside app, or our email at email@example.com.