Can I just attach the appointment letter so that I can receive AOR and apply for PGWP extension
As per current scenario, if you are missing any document or medical test is pending, you can still submit your application with a letter of explanation. Your application will not be rejected as incomplete. Once you get the missing document, you can submit it via webform.
https://www.canada.ca/en/immigration-refugees-citizenship/corporate/publications-manuals/operational-bulletins-manuals/service-delivery/coronavirus/permanent-residence.html
If a
new application is missing supporting documentation (associated fees are required), the applicant should include an explanation with their application that they are affected by the service disruptions as a result of the novel coronavirus. The application may then be promoted and reviewed in 90 days.
New applications should be promoted in the order they were received, and the org ID should be associated with them when the applicant self-identifies. If the application is still incomplete in 90 days, officers should request the missing documents with an additional 90-day deadline.
Applications found to be incomplete with no explanation provided, or for reasons unrelated to the disruption of services associated with impacts of the novel coronavirus, may be rejected as per section R10, and all fees associated with the application should be refunded to the applicant. The reason for rejection should be unrelated to the disruption of services.