The more, the better, just get a rental agreement if you can.
Not sure about the embassy where you're applying. I've heard Wise statements have been rejected as financial evidence by some embassies. If the cash is sitting in a normal bank, no problem at all.
Congrats! If your situation is legal, usually it helps to stand one's ground politely and to explain why everything is legit. Obviously, it's stressful though.
OrangeLion756 It may sound a bit odd, but one can send them a cover letter through the requested document upload. Many of us have done that to explain our personal situation. In your case it does not look very promising though, I have to admit.