the US doesn't provide income affidavits. However, you should be able to start out with 800k in the bank and during that first year, transfer 65k in every month, from the US. For your second year, you can continue the monthly transfers and do whatever you want with the 800k. But for the first year, you must meet all the requirements of the banked funds method, and you must have 12 monthly deposits, one each month of 65k or more to switch.
An additional note -- you'll also be a tax resident of Thailand if you stay here for more than 180 days in a year. Thailand and Canada have a tax treaty, but I'm not sure of the details.
Air pollution is a risk factor for lung cancer, emphysema, heart disease, stroke, and dementia. Some of these may not have obvious warning symptoms so no one can say 'it doesn't affect me'.
The air quality isn't what I'd call good the rest of the year. It's average. Historical data is out there for anyone who wants to research.
Chiang Mai was the most polluted city in the world one day last week. I love the city -- I lived there for a year. But long term it's not good for your health.
The banking rules changed in 2023, maybe about a year ago? So, anyone in here saying "It's easy, I did it" and it was from a year or more ago, is giving outdated advice.
Sometimes, an immigration office can help by communicating with a bank that you're applying for a long-term visa.