请把这句话翻译成英文 谢谢大家 在线等

Do I have to provide the customer with invoices for the free samples transported by air except for the packing list and quality warranty?

As for the free samples mailing to Indonesia by air, should I to provide an invoice to the client in addition of the packing list and the warranty certificate?

请问空运印尼的免费样品 我除了给客户寄装箱单和质保书 是否还要提供发票？
Concerning sending free samples by air, except that I will send the packing list for customers and the warranty of quality, shall I send the invoice too?