I usually submit my completed return online using Intuit - not sure how to attach a PDF to my return and do this online as well? Or do I mail it in separately? thanks
Unfortunately, you cannot submit supporting documents with your NetFiled tax return. You can submit any documents to CRA online through your CRA My Account, if you are signed up for one though.
Here's the CRA information on submitting documents online: https://bit.ly/2TNXmCn