@Ian *********
Yes, I’m sure I handed the DTV printout to the IO along with my passport. The IO took a quick look at the DTV printout, but didn’t seem to take it into consideration.
Regarding my cancelled application, I had taken screenshots before submitting it, and the biodata matched my passport exactly. During my Vientiane interview, I was also told that a cancelled application attempt isn’t visible to the next embassy; they can only see a rejection.