Does the seller pay the mortgage, taxes, utilities on a house with an offer waiting for bank approval? Once the bank approves and accept the short sale offer might there be additional charges if the seller has not been paying mortgage on a home where he no longer lives? If they accept my offer do they often come up with other charges left behind by the former owner?

In normal sales, usually the buyer pays for it and requests reimbursement from seller in escrow.
But for these short sales, when it’s really all in the bank’s hands, does buyer still pay for short sale or does the bank have their own people do it?
I dont want to pay for this appraisal, then if the house doesn’t appraise and we decide not to get it, I am stuck just wasting a couple hundred buckson that appraisal.