Hi, Xiaobaitu,
I filed I-539. I have received a receipt from USCIS (got receipt number) and the case is still pending. But, I forgot a very important document: I-20 in my application (I know that is very stupid). Can I send USCIS the document (with a copy of the receipt)? If I do send one, will USCIS put the I-20 into my application package? Or they will throw it away since I send it without their requesting?
Thank you very much!
Ying