You should see the request letter received from cic. They can ask you to submit via our CIC account. Go to "view submitted" application and you can see a list of uploaded docs. If they request fbi pcc, you should be able to upload doc in that page. So don't just directly go into CSE if the request letter says to submit via CIC account.If anyone looking for How to submit FBI PCC to CIC after the submission date?, refer to the below link:
http://www.canadavisa.com/canada-immigration-discussion-board/threads/how-to-uploade-fbi-pcc-after-submission.314806/
Please share your experience.