Automate invoice and packing slip attachment emails to customers when invoice is generated

Hi,

I am able to save invoice on local drive and then attach invoice and send an email through code. But unable to save and attach packing slip to the same email. 

I see the code for multiple attachments in AX 2012 but SalesPackingSlip.Report is not being attached. 

Any Insights on multiple attachments or parameters needs to be passed to create and save - Packingslip.

Thanks,

Srujana