Generally you would treat “Petty Cash” as “Cash in Hand”. If/when you deposit this to a bank account, you would “transfer” the funds from Petty Cash to the bank account on QuickFile, therefore reflecting what actually happens.
So in a nutshell - yes, you would do it through petty cash.
I can’t see an issue with this. The receipt hub (tied with Dropbox or emailing in your receipts/invoices) should work well with this.
Nothing on our planner at this moment in time, but you may wish to add your support here: Zettle integration
Hope that helps?