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On invoices, when you are able to attach receipts, when "Attach Receipts to Invoice" and, under that, "Show only fields selected above" are checked in the Expense tab of the flexible template options, the invoice still displays all the fields and not only the selected fields.
Additionally, there is no way (and should be) to change the "Receipt" header for each receipt. If a user can change the section title of the Expense Detail section, they should be able to change the title of each receipt too, to match the header.
How often would you use this request?
For expense billing and whenever other attachments are required on invoices/statements.