when a Canadian citizen mentions he gets a 90 days visa, he surely means that he can enter with a single entry tourist visa, receive a 60 days stay permit which he can extend for 30 more days stay permit. In his eyes, it would be a "90 days visa". In reality, there is nothing such as a 90-days Tourist visa. There only is a 90-days single entry Non-Imm-O visa based different reasons
that's exactly what I am saying. You can do a change of visa type on a visa exempt or a tourist visa. But NOT on a VOA . . . Are you not capable of reading?
and you do NOT have a 12-month visa. There is nothing such. You received a "1-year Extension of Stay Permit". You are in Thailand on a "stay permit", not on a "visa". Check the stamp you got, what does it say? It says "extension of stay permitted until" and a date
because when you hold a VALID visa, Immigration will NEVER issue any other category of entry. You cannot legally hold two different visa or two stay permits at the same time