Can I apply for a Medical Visa or Extension at the Chomchuri 1-stop Office with an M-type Visa?

The inquiry is about whether a person holding an M-type visa can apply for a medical visa or an extension at the Chomchuri 1-stop office or if they need to go to the Chaengwattana office. Comments indicate uncertainty around the procedures for changing visa types and extensions, highlighting the possibility that applications for a medical extension might need to be handled at Chaengwattana, and suggesting that immigration officers have discretion over these matters.