I went to Chaengwattana Immigration yesterday for my third 60 days extension due to Covid 19. I brought with me a passport photo, passport copies of the information page, last visa stamp, tm30, tm6, embassy letter and filled out 3 forms given at the immi office. It went all good. Last extension expires Dec. 25. I went to Chaengwattana immi on Dec. 23. I was given until March 1, 2022 for my third Covid extension. Just sharing my experience.
TLDR : Answer Summary
The user shared their experience obtaining a third 60-day visa extension due to Covid-19 at Chaengwattana Immigration. They successfully provided necessary documents such as passport photos, copies, TM30, TM6 forms, and an embassy letter. Their extension was granted until March 1, 2022.