I cannot say 100% but I am sure the one on your phone should be enough if needed at all. I have have come in through BKK twice now since implementation and no need to show. If they can see your immigration record and visa it would seem the TDAC is viewable.
I'm my immiigration queue Monday about 10 in front of me sent back by IO at the counter. for not having it. However, when I came in 3rd May they were checking before you got to the queue and sent to the terminals where there were helpers.
Yeah - this was Chiang Mai and obviously only people who had completed one. All my papers had been checked and were being processed. I sat down and she shouted my name and asked me to go and get a printed copy.
No need to print it for entry. It is sent by email or you can download it. I have come in two times since May 1st and not even had to show it. It is tied to you passport and visa number so the IO has it on the screen when he scans your passport.
I did not find the problem. Immigration sent me to have a copy printed. I was submitting documents for an extension and they wanted a copy of the TDAC - I was not the only one sent to get it printed off. Is that simple enough for you?