What are the requirements for submitting documents for the Online O-A Visa application in Thailand?

Online O-A Visa application advice.

I am currently in the process of applying for the Non-Immigrant Visa “O-A” (Long Stay) online at thaievisa.go.th as I am from the UK.

My questions are:

In the application is asks for scans of documents etc, do these actually have to be scanned images or are phone photographs accepted?

One of my proofs of financial evidence is a downloaded Premium Bonds statement. This only shows proof of balance, but not when the deposit was made which was over six months ago, would this matter?

When you send in your passport for the visa do you also send in the supporting documents? If the answer is yes can you send in self printed statements from your bank?

TIA