hey, I was filling the application for MCS in computer science from ASU. There's a tab to upload uno

hey, I was filling the application for MCS in computer science from ASU. There's a tab to upload unofficial transcripts. Once I submit the application, can I send the official transcript by mail after the deadline? because dead line is very close (1 Dec). Also, whenever it needs to be sent, is it important that I send it through my college? I mean I have the physical transcripts. can't I send them myself by mail?