What are the experiences and requirements for extending an OA visa in Thailand?

Just returned from my annual visit to immigration CW . Although this is my third successful extension on OA , always a stressful experience regardless of having every document you think you need. It amazes me that although I submit the same documents every year they scrutinize as if it’s the first time they’ve ever seen such documents; talking primarily a financial records; I submit by income so a bit more complicated ; interesting that this time I was instructed to sign an information page so that I could have a picture taken with it ; it’s the page that lists the various financial requirements. Anyway thank you for those on the site particularly TD and BH your advice and info is invaluable 🙏