I have a Canadian friend who applied for a multi-entry tourist visa. Unfortunately, since Canada is apparently "backed up" he was not granted the visa before his flight arrived in CNX and had to enter with "visa-exempt" status. Is it possible to change to the mutli-entry tourist visa if they receive it after landing here? Thanks!
TLDR : Answer Summary
A Canadian friend who entered Thailand with visa-exempt status is able to switch to a multi-entry tourist visa (METV) once it's issued after arrival. They must exit Thailand and re-enter to activate the METV, presenting the necessary documentation. This can be done via land or air.