Hi chesprod,
If you open the Email Queue in Adagio, for forms written to the Queue but not yet sent, and select one or more records from the grid, you can right-click and choose Attach File to include other files of any type, including Excel sheets.
There are no options to attach file types other than PDF directly from the Print/Email Invoice screen in Adagio. You have to do this sort of attaching from the Email Queue. This would mean that you have to send the emailed 'To the Queue' rather than 'Now', to give you the chance to include those extra attachments.
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Regards,
Softrak Tech Support