Went to Chiang Mai Immigration today to get the next Covid-19 extension. My current extension expires 28/02/2021. Was given an "under consideration" stamp and was told to return on 15/03/2021 with my passport. No other papers necessary.
TLDR : Answer Summary
The user visited Chiang Mai Immigration to apply for a Covid-19 extension before their current visa expired on 28/02/2021. They received an 'under consideration' stamp and were instructed to return with their passport on 15/03/2021, with no additional documents required. Comments clarified that no papers were submitted during this initial process.