Document PDF Filename does not (seem to) work

I would like to change the PDF filename of the invoices from the default “Invoice-12345.pdf” to “12345 Invoice.pdf” so that they, and associated documents from the bank and customer such as Purchase Orders, can be easily sorted by invoice number. I tried changing the Documents > Invoice > PDF Filename field to “{{invoice_number}} Invoice” and “{{order_number}} Invoice” but the downloaded invoices still have the default filename.


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