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8老师,

 The primary sponsor or joint sponsor should put all the form and supporting documents in their own envelop, seal and sign over the envelop flap, otherwise USCIS will not accept it? 

-Don't staple or glue the documents, and just clip the pages of each document together using a paper clip. Put all of the sponsor's documents and the joint sponsor documents together (not need to put their documents in to their own envelop and seal).

Or just glue the flap and sufficient?  Thanks.