---邮寄材料里的efiling recipt是填完表格之后生成的Confirmation Receipt?还是几天之后uscis 邮寄过来的official Receipt Notice (Form I-797) ?
-It is the Efiled verification receipt (print it out) and send all the support documents with this receipt to the address indicated in the Efiled verification receipt
---到底是邮寄i94原件还是copy?
-Photocopy is OK.
---邮寄可以用usps express吗?还是普通平邮?
-If the address is mailbox, no Express Mail.