I need some suggestion here. I need to attach a pdf(for e.g. a invoice copy) on user demand. Which I am trying to implement it via Triggered send. Sender system can send the PDF along with the customer's email address using API (to same endpoint or to different based on SFMC feasibility). Now, can I use Content Builder to get the pdf and Triggered send to trigger the email; using AttachFile() to add pdf dynamically based on the email address along with pdf's name sent in the Triggered send and pdf uploaded into content builder ?