What documents do I need to show for indicating my current location when applying for a visa from Vietnam?

When applying for a Thai visa from Vietnam, you are required to provide a document indicating your current location. Community members suggest various acceptable documents, including a flight ticket, hotel booking, entry stamp from Vietnam, or even a selfie holding a receipt with your name on it. Some users reported that they submitted their Vietnam entry stamp alone, while others included additional documents such as boarding passes and hotel confirmations, which were not always requested.