Enabling auto-generated invoices allows invoices to be automatically created within the Kalo system once a task is marked as complete.
You can turn auto-generated invoices on by visiting the Team Settings within the Admin tab. Once here, scroll down to the Finance section and select the box on 'Autogenerate Invoices'.
Bear in mind that for an invoice to be auto-generated, there must be a fee assigned to the Task. If there is no fee assigned, an invoice will not be created - see below for reference of the missing fee:
If you mark a task with a fee (in this example, $100) as completed, an invoice will automatically appear under Invoices tab with an icon indicating that it was auto-generated:
Now you can easily approve the invoice by clicking on the three vertical dots and then 'Approve invoice'.