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Is there a way, in a flow, to add an attachment to a PDF (as would be shown in Acrobat by View > Show/Hide > Navigation panes > Attachments)? Or some other way to store a file into a PDF for downstream processing (for example a large embedded metadata object)?

PDF Toolkit can add attachments to PDF files. you can run it with Execute command and als use Execute Command Friend app to configure the settings.

https://www.pdflabs.com/docs/pdftk-man- ... -op-attach