Hello ,The instructions on the letter weren't clear enough. I sent a webform with the same questions as yours, and the answer was "to consult the PR letter". So, based on my interpretation of my PR letter here is what I did:
1. I signed and dated the IRCC copy of CoPR.
2. I only send IRCC copy, mainly because we need CoPR for a citizenship application in the future.
3. I sent an extra copy of the same photo with my name and UCI on the back.
According to Canada Post, the documents were already delivered. I linked the PR card application to my IRCC account and there is no update on it.
May I know if you have received your PR card?