Proof of location usually just to upload the ID-page of your passport one more time, your driver licence, print screen of residence registration, utility bill or bank letter with name and address. For a child u use option one.
You might risk they’ll email you ask you to upload all pages including blank ones in your passport.
Yes, I know. Was denied myself with a Non O and residence certificate in Isaan. (Asked for a housebook or work permit as well). Also denied in 2 branches in Chonburi without extension of stay(they asked for minimum one year "visa"). Allowed in one in Jomtien without any issues.
Almost impossible without a Non O visa, and even then you might meet some difficulties. Some branches also demand a housebook or that you’ve done your first year extension of stay to get an account, but you will succeed with a Non O if you visit several branches.