well, I have sent
the original I-797 to the state department.
Of course, PhotoCopy will do and no need to send the original, I still sent my original notice of approval as my I-94 card is expired and the new card is with the approval notice.
Remember you need to send the Original I-94 Card.
I could have deattached my I-94 card from the I-797 and sent it.
But I did not do that way. I have sent the Original I-797 for stamping. And still waiting for my passport and I-797.