Is an electronic transfer required for the 800,000 Baht bank deposit for a Non-O 1-year extension in Thailand?

The 800,000 THB required for the Non-O visa extension does not necessarily have to be shown as an electronic transfer from outside of Thailand for the annual extension. However, if converting from a tourist visa to a Non-O visa at an immigration office, the funds must be a foreign transfer. There are also discussions about the necessity to prove the origin of the funds, which may vary by location.