Australian citizen. Just got out of HKT immigration at the airport, went through on an O-A which I got from the Royal Thai Embassy in Canberra Australia. No issue with the visa but the officer got out his phone and took a photo of my passport photo page, the visa page and the arrival TM6. He said it was the same for all first time O-As and his boss would get the photos. Stamped the date and waved me through without any other issue. Has anyone else experienced this?