Can I use my FCD USD account at Krungsri bank for my visa extension application in Thailand?

Used my Krungsri, FCD USD account for extension renewals for the last 5 years , never had an issue

There is nothing in immigration rules that prohibit foreign currency accounts as long as they're in a thai bank account in your name only and you meet the seasoning requirements.

Definitely get a year detail transaction print out from your bank. As people mentioned some banks can't print it on demand and it can take up to a week to get one Allow for that so it doesn't catch you out.

And to address the "appeal" issue. IF you feel that you were not treated according to the immigration rules you can request to file a written appeal, Those have to be sent to Bangkok so most smaller backwater offices don't want you to do it as it puts them under the microscope.

I Tried to Use My USD Krung Thai Bank Account Several Years Ago in Phang-Nga for the Equivalent of 800 000 Thai Baht and Was Told it was Not Acceptable and Had to be in Thai Baht Only Im NOT Disagreeing I'm Just Stating what Happened to me

You must/should ask for a bank statement for 3 or 12 months, depending on which visa you are extending? If more than 6 months, it will most likely take a week or more for the bank to avail it.

You will need a statement showing MONTHLY BALANCES from the Thai bank account you are using for the verification of funds for your one year extension of stay as retiree.

As there are minimum balance requirements during the year that must be met to get the extension you need approved.