What information do you need to give upfront when a mortgage broker is assessing your eligibility?

I spoke with a mortgage broker today and after initial phone conversation, he's asked me to send bank statements for the last 6 months to assess if it looks funky (I'm a sole trader). He also asked for my driver's licence to do a credit check.

I thought the driver's licence was only needed to be provided when there's the pre-approval?

Just wanting to make sure what the process is and what I actually have to provide when getting a borrowing capacity estimate. It seems weird to me to be handing out all my driver's licence details to brokers and them keeping it when I likely will just be needing 1