Invoice Actions drop down is not showing up to Update, Validate, Approve the invoice

Summary:

We opened an invoice in Manage Invoices page to update it but the Actions drop down is missing. We need that option showing up in Manage Invoices page. Something has changed in our lower instance when we are testing custom Accounts Payable Specialist role. Is this related to missing privileges or any customization? Any help is much appreciated. We need the Actions drop down showing up in Manage Invoices page.

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