Documents must be presented not later than the expiry date of the credit.

单据不得迟于信用证到期日提交。

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COMPANY official documents and insurance contracts. verify expiry date, keep list update and take care of annual check for official documents.

公司官方文件和保险合同，核实有效期，保持列表更新和注意年度检查。

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Transport documents must be presented within 21days after the date of shipment but within the expiry date of this credit.

这里只是说要求交单是在装运单据的在21天之内不超过信用证有效期。

youdao

There is also an expiry function, after which no one can open them -- same for documents.

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