Supplier should be able to add additional attachments to the submitted Invoices in Supplier portal

Summary: Once an Invoice is submitted in the Supplier portal by a Supplier then the Supplier should be allowed to add additional attachments to the submitted invoices. Currently, only AP team is able to add additional attachments to those submitted invoices by Suppliers. Require the same option for the Suppliers as well to add additional attachments to the submitted invoices in the Supplier portal

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