If you want to copy 1688 product details to AliExpress, you can follow the steps below:

Open the product details page you found on 1688.

Select and copy the entire product details page in your browser. You can use the shortcut keys Ctrl+C (on Windows) or Command+C (on Mac) to copy.

Open AliExpress's Seller Center and go to your product management page.

On the product management page, find the product you want to add product details to and click Edit.

On the page for editing a product, find the product description or details section.

Click the edit box of the product description or details and use the shortcut keys Ctrl+V (on Windows) or Command+V (on Mac) to paste the content you copied from 1688 into the edit box of AliExpress.

Make sure the content you paste is correct and the format is consistent with the requirements of AliExpress. You may need to make some adjustments and formatting based on AliExpress's editing tools to ensure that the product listing is presented well.

When you have finished editing and formatting the product listing, save the changes and submit the item.

Please note that according to AliExpress's regulations, you may need to make some additional adjustments and modifications to comply with its platform requirements and policies. In addition, make sure you comply with copyright and intellectual property laws when copying and pasting product listings to avoid infringement.