They seem to want ALL documents updating if extending, so bank account proving you still have 500k baht, activities updated, remote working updated etc .
if you want to extend another 180 days those are the rules. You can only extend ONCE on each entry. Easier to leave for a few days/weeks and re enter , no questions asked
Reports on here say ALL documents originally submitted updated , money MUST be shown in Thai bank account for 6 months, cannot drop under 500k. Proof of residence etc