On the website it’s mentioned:
2. Passport
You must scan and upload a copy of the personal details page of your passport and all pages that contain Canadian visas and entry stamps.
Since I did not have any Canadian visas and/ or entry stamps, so I did not upload all the pages but first and last page.
Yeah, that's why I had the confusion. There's conflicting information within the portal. So I'm going by the guide just to be safe. The guide says this:
2.2 Your Passport (mandatory)
A copy of your entire valid passport.
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Your passport copy must include clear copies of ALL pages including your personal details page, all blank pages, temporary resident visas, entry stamps, and/or any other immigration stamps.
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If your passport was issued within two years of applying to the OINP, you must include copies of all of the pages of your last passport.
Note: Your application will be returned as incomplete and your application fee refunded if you do not provide ALL the pages of your passport.
2.3 Your Family Members’ Passports (mandatory, if applicable)
A copy of the personal details page from the passport of each dependent family member. Dependent family members can include your spouse or common-law-partner, your children under the age of 22 and their children.