Automatic Expense Auditor Assignment and Expense Report Visibility

Summary:

Can anyone please explain on the standard Expense Report audit assignment behavior:

1. When an expense report is selected for audit and reaches Pending Expense Auditor Approval, if it is unassigned, is it visible in the Expense Reports Pending Review dashboard for all eligible Expense Auditors, or only under Unassigned Expense Reports?
2. Does an Expense Auditor need to manually assign an unassigned expense report to themselves before auditing it, or can Oracle automatically assign the report to an auditor?
3. If automatic assignment is supported, how can we configure Oracle to automatically assign an expense report to a specific eligible auditor based on defined criteria?