How are attachments exported to QuickBooks Online?
When an expense report is exported, all the reimbursable expenses in the report will be exported as a single bill or a journal entry, as configured in the Integrations page. And all the non-reimbursable expenses in the report will be exported as individual expenses.
If your expense report was exported as a Bill or a Journal Entry, the PDF of the report with the receipts will appear as an attachment in QuickBooks Online. If there are non-reimbursable expenses in your report, the receipts will be exported as attachments of the expenses.