Hi,
ref your last.
1. Not sure what is meant by "multiple status" document. In our case the Immigration advisor said it is only required to upload the Front Page of the current valid work permit for both the Applicant and Spouse.
I came here on work permit and it got extended multiple time, so I have more then one work permit
2. TRV stands for Temporary Resident Visa, right? If yes it is only required to upload the passport page with has the current valid Canadian Visa. (not sure how you can have multiple valid Canadian Visa in multiple passports?)
Each time my assignment got extended, I got new work permit and accordingly I got TRV stamped. As one of my passport expired, I got new passport and TRV was stamped on new passport.
Also, we are already in Canada
3. Sorry this I don't know. I am not familiar with the process where the family dependents will be entered in the system as this has been done by my Immigration advisor. Would recommend to check with more senior users where to add all dependents and the upload of Family Member proof correctly (in this case for your Non-Canadian child).
cheers.