You may have to show PROOF of your DTV Visa to airline staff on check-in for your flight βοΈ to Thailand...even to the connecting airline staff. Or to the land border crossing entry Thai Immigration Officer.
Upon arrival into Thailand, show the DTV visa to the Thai Immigration Officer and look at the STAMP placed in your passport to be sure you are STAMPED in for 180 days.
it's a wise decision to have with you the documents you submitted with your DTV Visa Application. Just in case of questions from Thai Immigration Officers upon arrival into Thailand.