What are the requirements and process for obtaining a 60-day Covid visa extension at Nan Immigration?

A user successfully obtained a 60-day Covid visa extension at Nan Immigration, sharing their experience of the process. They mentioned that they received two stamps on the same day of application, and that moving from Bangkok to Nan required filing a new TM.30 form. Important documents included an embassy letter, the extension forms (TM.7 and STM.2), and copies of their passport ID page, latest visa stamp, and TM.6. The user noted that Nan Immigration is not very busy and allows walk-in applications without the need for an online appointment.