Document required for Non-B extension update, list taken from CW office on 2 March 2020. Also was Informed during the document submittion there might be a visit to the office during the 1 month of consideration period.
TLDR : Answer Summary
The post shares an update on the documents required for a Non-B extension as of March 2020, which were confirmed during a visit to the CW office. It also mentions that there may be a visit to the office during the one-month consideration period for the application.