I will be visiting Thailand next month. I qualify for the 45 day visa waiver, but was thinking of getting the 2 month TR visa so I can stay longer. I was trying to fill in the COE application today, but it requires me to upload the visa, which I don't yet have. Does anyone know if there will be problems if I get the COE under the visa waiver and then subsequently get a TR visa? Will the original COE still be valid, or will I need to apply for another one?