Auto-approval step is an additional first step in workflow (except Vendor approval workflow) available during Trial period and Advanced feature trial period and in Advanced/Premium plans. With this step you can specify rules for automatic approval of request despite rules specified in other approval steps or workflow settings. If the request met criteria specified in this step, it will be automatically approved right away.
Here is how to setup auto-approval step.
Feel free to watch our video on How to configure Auto-Approvals: