According to the policies of most e-commerce platforms, once an order has been generated and paid, the delivery quantity generally cannot be modified. Because the order has entered the logistics stage at this time, the quantity modification will affect the plan and schedule of logistics operations, which may cause great confusion and trouble.

Therefore, if you need to modify the delivery quantity, you should carefully check the information before placing the order to avoid errors. However, if you really need to modify the delivery quantity under special circumstances, you can initiate a refund request to the seller or customer service and place a new order to ensure that the final order quantity is correct.