In Marketing Automation journeys, when creating an email, you can add "dynamic content" - in other words, you can add specific paragraphs, images, buttons, etc. One thing that isn't available is the ability to add "dynamic attachments" - a different attachment based on a condition.
This would be very helpful in the case of having multiple lead generators available on a website that can be requested by completing a form. Once he submits the form, he is sent a standard email - but the attachment he would get would depend on the lead generator he requested.