What documents are needed for a COVID-19 extension at Bangkok immigration, and is an embassy letter necessary?

NOTE: this post is about CW/ Bangkok immigration only.

1. Your passport and:

a. a copy of your data ("picture") page

b. a copy of your most recent visa (if you have one)

c. a copy of your most recent stamp

d. a copy of your departure card

2. [MAYBE] A TM30, filed in the immigration office.

3. The forms. You can find the forms in this group FOR BANGKOK only, by clicking on files.

4. 1x passport pictures

5. 1,900 THB.

The letters from the embassy are NOT required from reports.