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Hi @guy.foord-kelcey,

I think "'blank' option in the 'Export…' dialog box" is a bug, but not the absence of Export to PDF option, because on this Help page:
https://help.autodesk.com/view/ACDMAC/2021/ENU/?guid=GUID-A72DB257-3410-4792-B548-6B9FC1DED72B
you can see: "Note: Use the PLOT command to output a drawing to PDF."