people who do this need to understand it's a risk and you could be denied and lose your fee. While some people have been successful with it and others haven't, it's random chance. Some people have been called in for interviews, asked for all passport pages after submission and other information. There are also comments from various people who were questioned when they tried to enter on the DTV on a border run when the IO noticed the visa issue date was while they were in Thailand.
sorry, wasn't clear. Some people have commented that they ask for copies of all passport pages, one person mentioned in "dated" photos, also randomly call people for interviews and that sort of stuff.
that's incorrect and can, in some cases, result in your application being cancelled and loss of the visa fee. You are supposed to apply in the country that you are physically located in. They can and have asked people to come in for interviews, proof of location and copies of passport pages.
do a search through this group, expand your horizons and search through some of the numerous other Thai Visa groups. Head to Reddit to the numerous subs and search. The posts are out there. As mentioned, sometimes with little to no info as to prior entry, etc which may impact why they were asked.
We've returned twice on our DTV and have yet to be required to show anything other than our boarding pass and visa. It's entirely random if you'll be questioned or not so best idea is to be prepared with your documents.
many people have reported being questioned on re-entry and having to show documents like contracts, bank info, etc. Wasn't always clear what the past entry history was though and if that affected anything.
so you take your passport, your tm30 and go to your nearest immigration office. You fill out the form for 90 day report, hand it all in and you'll get a document showing it as filed. You'll need to keep that if you decide to do an extension. Once you have your visa, the embassy is no longer involved.