Hello, the same was my case. But still they asked me for my PCC even though I was in Canada when I turned 18. So as per their request, I had to apply for a PCC right away. (You could get it done from your local district police station too).
Also if they request for a PCC, there is no other document which you could upload on the portal. It asks for the document number, it’s issue and expiry date, etc. It won’t let you upload until you fill those things out.
So for that just get your PCC done if you had an ADR because eventually we have to listen to them