Like every message you get when applied online only .. I got one of those DONTREPLY meassges telling there was a new message in my account so I checked my account on Government of Canada website and found the letter. I think the only way to send a new document is by following the instructions here
http://www.cic.gc.ca/english/helpcentre/answer.asp?qnum=1310&top=23
I did follow it thoo

I really feel like I might have missed something but I’ve been checking my account and doing the steps to add a new document but nothing clickable.
Pardon my English but MyCIC stands for what ?