@Jon *******
, just checking, because if you're from a country that still issues the income from abroad affidavit notary you can't use monthly income via transfers you MUST use that notary paper
BUT
The USA stopped issuing the income affidavit notary letters back on Dec 31st 2018.
You'll be good just with the bank print out showing a year's worth of international transfers along with the regular bank letter saying your name, account number and the balance the date you got the letter and updating your thai bank book on the date you apply for the extension :)