Hey guys,
I got a reply from CIC, this is there message
Thank you for contacting Citizenship and Immigration Canada.
Due to a system limitation with the online application, certain document fields will not be auto-populated in the document checklist. Please note that you may upload your passport (or any other supporting document) to the Letter of Explanation section of your online application’s document checklist.
We hope this information will help you, and we apologize for any inconvenience this may have caused.
Unfortunately for me, my wife and I have so many stamps in our passports, both old and new and we have exceed the
4MB size (both our passports), this is after reducing the pdf size. I sent them another message asking what is the other option, since uploading our passport together will be over the size limit