I’m in Chiang Mai - not done it myself and do check but met loads of people who keep doing covid visa extensions indefinitely - they say to the visa office that they can’t return home due to covid.
CHECK THIS YOURSELF - also this will end at some point.
OK I just filled it in again to try to remember - and I think I know.
It NEVER prompts you to pay - after you fill it in it appears you're done - but you have to select it and click 'pay now' LMFAO.
So I did it now on the off chance somebody in the embassy gets it (perhaps they get shown the most urgent ones first) - and will take pity on me before tomorrow...
ta
Still doesn't explain why the original totally vanished from their system