If your spouse has received the email but the upload has not been enabled:
Step 1: Call CIC and report the technical issue. They will direct you to do Step 2. Please do step 2 only after calling and confirming with cic as they can resolve the upload issue.
Step 2 to send Schedule A + PCC to CIC:
Upload physically signed copy of Schedule A + PCC via IRCC Webform (one of my friends uploaded electronically signed, CIC asked them to upload a physically signed one)
Step 3: Send a physical copy to CPC-Mississauga (this is done as IRCC Webform has a huge backlog)
For sending the physical copy via courier:
1) Cover letter explaining the whole scenario
2) On the envelope - state the following:
Applicant Name
Application #
Family Class - Spouse Outside Canada
3) Mailing Address:
Case Processing Centre – Mississauga
2 Robert Speck Parkway, Suite 300
Mississauga, ON
L4Z 1H8