I submitted TRV application with the IMM 5754 approval letter together with a letter of explanation from my home country. My TRV was approved. But to be on the safe side, you should wait for the actual copy as they sent out the letter pretty fast. I was impatience and thought it might take awhile for the actual permit to reach my Canada address. PGWP approved on 16/9, paper submission of TRV on 18/9. And guess what, actual permit reached my Canada address on 19/9. LOL! As I was doing paper submission, there was no way for me to send additional information unlike online application. Thank God that the officer approved the TRV without request of the actual permit.