Hi Liz,
This option is found on the Print/Post tab of the Invoices company profile, in the top-right box with the Printing label.
Enabling this option will create a PDF file in the SoftPDF folder (and the DocStorage folder when DocStore is used). This PDF would be available to attach to AR Customer statements as well as be viewable in various places in Adagio modules.
If you are attaching externally created PDFs, then Doug is correct that they have to be named a certain way in order to be attached to customer statement emails. And saved in the SoftPDF folder so that the Process SoftPDF to DocStore procedure can 'file' them to the expected place(s) for Adagio to use them in customer statements.
Externally attached PDFs do not require a specially named format if all you are doing is viewing them in Adagio.
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Regards,
Softrak Tech Support