Will Immigration Bureau Accept a Visa Letter on My Phone Instead of a Printed Copy?

There are print shops in the basement of Chaengwattana,

NO, you need to print it and just so you're clear NO ONE <- as in NOT ONE SINGLE PERSON got a 30 day unable to travel due to covid-19 extension with that b/s letter from the US consulate.

They emailed people who were denied extensions and said they are "reviewing" the problem.

(also check your messages I've messaged you before and you never read them).