ApprovalMax pushes only fully authorised Invoices (i.e. all assigned Approvers have approved) to Xero. Once an Invoice has been fully approved, it'll bear the Approved watermark and have the approval audit report attached.
You'll be able to open it in Xero using the link provided in the document:
If an Invoice has not been fully approved (not all approvals have been collected), it won't be pushed to Xero:
Users with the Administrator or Auditor role can use the reporting feature to show all Invoices pending approval, and also see whose approval they are waiting for: