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Mailjet plugin and attachments form the designer

Hi there, I would like to use the mailjet plugin and e-mail form the email context and a attachement from the print context just as I would like to do in the designer. (attach pdf as printcontext) In the manual I noticed I have to use the filestore, is the printcontext pushed to the filestore and how to I add this data to the mailjet plugin?
Looking for a simple example so I can understand the concept here.

Any help much appreciated,

Rob