The following post is closed http://www.gravityhelp.com/forums/topic/conditional-notification-and-routing where Carl Hancock said:
"Gravity Forms can route the Admin Notification to an email based on a choice in a select box, so it can do this part.
However it can't send a User Notification with a specific attachment based on a choice in a select box. Conditional notification messages are not currently a feature, however it is a feature we plan on adding in the future."
I also need this feature of sending attachments conditional on values in form fields. However it's not quite straightforward. Firstly, I need to BCC emails to several recipients based on values in the form fields (which I believe I can do with the routing option??). But I ALSO want to send an email back to the person who submitted the form with an attachment which depends on the field values entered.