Please check... my understanding is that - If you have your marriage certificate, get it certified by the Thai Embassy in your home country. Once that is certified by the Ministry of Foreign affairs in Thailand, only one of you will need to have the 800,000 baht in a Thai bank.
, they can take the photos needed as well. Or you can go to the third floor of Central Festival (Head towards Central department store, on the left just before DTAC office there is a photo studio《??-i》- can't remember what comes before the -i 😁)
If you plan to leave 800,000 baht in the bank, make sure that your marriage certificate has all the necessary endorsements needed (so that one of you can be a dependent instead of both needing to meet requirements.