@dubby15
What you have advised about passport is not mandatory and waste of efforts
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. Please note what I am writing here in case you would like to help someone with the similar query.
@AtImechE you will need Current and VALID Passport only. You will need Bio Page + The page with any markings + Visa + Stamps (all from current and valid passport only). IRCC is not interested in your expired travel document.
Now if you have all the travels + visas and stamps in your expired passports then they are of no use to IRCC. BUT, I would always advise people that in case you are currently employed overseas and the valid visa of that country is on your expired passport then get your expired passport bio page + valid Visa scanned + the page where there is passport cancellation stamp.
Coming back to your query about MULTIPLE written, it is actually Umbrella term to cover all applicants. Multiple refers to the passport pages not expired passports. So here it means Bio Page + The page with any markings + Visa + Stamps (all from current and valid passport only).
I hope it is clarified, Good luck.