Immigration need to see letter from bank to show you have had money come in from your country evey time you renew your visa. A bank account is the 1 st thing you do correct
I’m English and had a new passport last year I went to immigration and the lady said I needed a letter from my embassy. When I told her I had just come in on the new one she was advised by one of the senior guys there that I did not need a letter from my embassy. That was Jontiem Immigration. Hope that helps