I'm in the same situation - I'm currently in Canada as an Outland Applicant, but this is what I've got in the PPR letter:
"STEP 4: SUBMIT YOUR DOCUMENTS
1. If you require a visa to enter Canada, please submit your package (Please provide your passport or travel document and a passport or travel document for each accompanying family member) through one of the Visa Application Centres (VAC). Your visa and COPR will be sent to you via the VAC.
2. If you do not require a visa to enter Canada, submit your package (Please submit one photocopy of the photo page and any pages containing amendments of the passport for you and one for each accompanying family member. ) via mail or courier directly to our office in Warsaw: Migration Section Embassy of Canada ul. Piekna 2/8 00-482 Warsaw, Poland
3. In Canada, to the Case Processing Centre (CPC-O): Submitting your document(s) in Canada If you have a mailing address in Canada and if you and all the accompanying dependents on your application are currently in Canada and plan to be in Canada for at least three months, you may submit your passport(s) to the Case Processing Centre – Ottawa."