You need to go to your local office and get the list of requirements.

Each office may be slightly different.

An up to date tm30 is required for almost any Interaction with an immigration office.

Its part of proving where you live and which office you need to use.

If your tm30 is Bangkok that's where you will have to apply etc.

You haven't stated what you are applying for.

If you are trying to apply for a non-b the company has to supply the correct papers including a wp3 basically a promise of a work permit.

You would then be granted a 90 day non-b visa which gives you the time to get the WP and then the company will arrange the 1 yr extension.

IF the company falls thru you are allowed to stay the entire 90 days on the non-b.

Every embassy makes their own rules as per who is charge there.

You must know exactly what the embassy you are applying at requires.

As these are all new applications to most, supervisors will have to make decisions at their discretion.

They can ask for whatever they want to support an application.

So some are easier than others, same as the immigration officers in country.

@Elías *******

no it's not.

That graphic is wrong.

Where did that come from?

A second company can be added to the work permit, as long as the 1st company agrees.

@David ********

no one is talking about OA.

A non-o obtained from your home embassy does not require any insurance.

The difference is an OA is a 1yr Visa requiring medical, criminal and insurance. It also allows multientry, that can stretch it to almost 2 yrs.

A non-o is not a longstay Visa, it is only a 90 day visa that must be extended in Thailand.

And requires 800k in a that bank or an embassy endorsed income.

** which the US does not do.

@Chris ****

and how did you stay in country?

Both are valid paths.

The embassy route is the smartest and most efficient.

And you will be extending the visa.

Not changing, renewing, etc.

You will find that terminology will be important to avoid confusion and potentially incorrect Information "lost in translation".

@Janelle ****

you have an attorney prepare one.