@Nicole *****
I dont think you will need a letter to prove that you work remotely as your payslips would confirm that anyway? So yeah screenshots should be OK. I can only go on what I have been told and as they are a well known business, they obviously wouldnt include any loopholes that may be available to manipulate. I know that if your platform(s) and students are all outside Thailand as is your salary then no problems from immigration will come your way
As for the tax, you are only eligble to pay tax in Thailand if you stay there over 180 days in one year. I dont know whether thats a calendar year that starts in January to December or whether it kicks in on the first day you enter until 364 days later.
Like I said Im only passing on the knowledge I have and would hate to give anyone incorrect info so anyone reading can come in and correct me at any point.
Will you be travelling around or based?