Supporting Documents Sent to IDR Create Separate Invoices

Summary:

When a supplier emails an invoice into IDR, the supporting documents they attach create a separate invoice for each attachment.

Content (please ensure you mask any confidential information):

We are currently having to download all supporting documents and merge them into one PDF before emailing IDR to avoid a separate invoice per document. Is there a way that we can leave the supporting documents as-is and have them simply attach to the one invoice?

Additionally, once the excel files are attached manually, they are not accessible by the approver. Is this expected behavior since they don't have full access to Payables?