as long as you have an active DTV i strongly suggest you keep the money in savings at all times.
I Know of now 3 people who left before extension came back and they were asked for supporting documents and proof of funds in savings and were denied entry due to lack of funds in account and DTV canceled they were denied entry
how do you think people apply for a DTV and NOT BEEN in thailand before how do you think its processed by people who can not get bank accounts and now DTV are not qualified for bank accounts due to recent regulations. The issue with using american account is the exchange rates changes.
You may have the equivalent at process but later the exchange changes and yiu dont. You can also convert USD into thai baht at an american bank and place it in savings account. Then providing said bank statements to the state department for certification if needed. Yes its easier to have a thai bank for it but again
How can they have a thai bank when they are NOT in thailand applying for first time.
As well you can not be in thailand to apply for DTV
yes providing his visa qualifies him for a bank account they are getting strict but again as long as the funds are in a deposit account not investment he will be good thai account or otherwise
Keep that money in savings as long as you have the DTV people are being asked to show proo of it upon re-entry now I know of 3 people that were denied entry for lacking the funds in the account keep it there. Safe way