Some of us don't use Transfer Wise or unwise. I do a transfer each month direct from my UK bank account into my Bangkok Bank account, usually taking a couple of days and with an acceptable rate (I think).
On my Bangkok Bank bank book transaction details it reads - code FTT - which signifies international transfer. So I have been thinking that is clear proof that enough money is coming in every month to satisfy Immigration when needed. But maybe I will need to get a separate letter of confirmation from the bank.
Today there was a "happening" with Bangkok Bank. My bank book was full and I went into Robinsons for a new one with my ID card etc which has all my passport, home address etc. details on it. NO - you are Foreigner - we need your passport, we cannot accept your ID card. I got cross and we left.
Went to BigC for shopping and into Bangkok Bank with passport for a new bank book. Filled in all the forms, signed passport copies etc. then NO - you are Foreigner - has to be signed by a manager and we have only an assistant manager - you must go to Surin City or Robinsons.
Back to Robinsons, trying to behave nicely, and they take my passport. then NO - this passport number is not on our records. This is even though a few months ago I successfully got a second ATM card in the Surin City branch using my current passport, ID card etc, copy signatures etc, as well as signing many forms and confirming that I had no relatives engaged in Thai politics.
The passport number on my current record details was from 2011 and expired in 2017. It had never been automatically updated even as a result of all the info recorded from a few months ago. Therefore I should go to Surin City branch and they will contact Bangkok. I refused to do that (despite my wife's embarrassment). To be fair the manager there was then excellent (I assume he was the manager), they made various phone calls and I got a new bank book.
My thoughts on all this, apart from the obvious, are that in an emergency, with the hopelessness of Thai systems, don't assume anything and take everything with you, re-submit everything, re-tell them everything, et al. What a nonsense - if I was Thai then my ID card would have told them all they needed. Mine did too, but I'm a Foreigner and it isn't allowed in the rules.