I can't Netfile my tax return as I am a non-resident. I have to mail a hard copy. Why my printed copy is only 21 pages long, whereas a duplicate copy is 36 pages?

A duplicate copy is also generated on TurboTax website. I think it would be more appropriate to mail to CRA a duplicate copy (as it contains more information), but on every page of the duplicate copy it say "do not send by mail".