pdf attachment blank in some email address

Hi, i have order to make webservice for send an email with pdf attachment.
i success create that and the email successfully send, but i got issue in some email the pdf i send is blank, how to solve this problem, because i didnt see any error in my flow service

Hi Irsyad,

can you provide an outline of your flow where you create and send the email?

Might be an encoding issue.