How to attach file in transactional email?



I want to know that how to attach pdf file in transactional mail, in every mail attach different-different pdf file.
Please provide me which email API is best for attachment and how to use.


I am having the same issue. Does anyone know if we can add attachments to transactional emails? If so, where can we find more details?

Thank you!


Have you managed to find a solution to this one?

The more I deal with Hubspot and its API the more issues appear. Has to be one of the most limited in funcionality and poorly designed APIs around…