How to attach a pdf to automatically when the user sends an email

Hey there,

I set up a form for the user to forward my pdf to another person from my website. But the issue is, how do I attach my pdf file to the email they are sending, as of right now the user is the only one who can attach the pdf file by uploading a file.

I want them to just send the email using my form but pdf file attach to it.
This is for a feature on my website “Email this CV to a friend”.

Any help is appreciated.

Thanks