Can I modify my order after the order has been submitted?

Can I modify my order after the order has been submitted?
Seller has not yet shipped: We will negotiate the modification with the seller.
Seller has shipped: At this stage, we are unable to negotiate with the seller for modification. If you insist on an exchange, you can apply for a return service after the item arrives at our warehouse, and then resubmit your order to purchase the modified item, but you will be responsible for the shipping costs incurred in returning the previous item.

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