@Mark *******
I included cover letters on everything and used ChatGPT a lot tbf but the group likes to overcomplicate it.
The portal is very straight forward, just make sure it makes sense for a human to look at. Have the balance easily visible, evidence the account is yours (your name & account number in bank statements etc), a cover letter explaining your work - I made sure to be clear I had no Thai clients or staff. For proof of location I included photo of exit stamp from Thailand, my flight itinerary to Aus etc.