Do you always add an attachment to your invoice?

[taherera]

Why or why not? 

[Minion]

I have the attachments added on 4 different service templates.   Each attachment is an aftercare and what to expect card I created for each service.  I chose to do this to save myself a little bit of money on buying physical ones from Vistaprint where I feel people just look at it once and then toss it out.