This is a generally available preview release, know as Preview Release 16, includes build 1.5.6.297 of Dispatch.
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You can now specify the format of the name PDF export file. The format string uses C-style formatting used in the printf function. The default format string is "Shipment Ticket %ld" for Shipment Tickets and "Receipt Ticket %ld" for Receipt Tickets. To pad the ticket number with zeroes, you could use %08ld. So with the format "Shipment Ticket %08ld" the export file name for ticket number 1 would be "Shipment Ticket 00000001.pdf".