Just happened to me as well in Chaengwattana, albeit at the initial conversion stage from visa exempt to Non O (retirement). All went well during the meeting, copy of contract and TM30, and proof of origin of funds from Transferwise were all accepted. The officer gave me a collection date 19 days later, but then just when I thought we were done when she told me I'd be getting a home visit. They rang me last week to make an appointment and showed up the next day. The condo manager was around and came up with them, and it was all over quite quickly, 3 or 4 photos at the door and inside, holding passport etc. Due to collect the stamp this week, so hopefully it'll go smoothly, ditto the extension a couple of months from now.