Add both photos and missing documents and resend. You don’t have
A new application form is not required (still under 90 days). Provide the missing documentation and send back. At least that’s what I did in my case
I guess it's Singapore. Singapore-im-enquiry@international.gc.ca
Send them a mail with Ottawa in copy requesting for the change. I hope this helps.
https://www.canada.ca/en/immigration-refugees-citizenship/corporate/contact-ircc/offices/international-visa-offices/singapore.html