title: How to prevent Mobile Safari from inserting a PDF's base64 encoded URL into an email when sharing?
body: <p>I have a javascript web app that generates PDFs client side in a user's browser (using pdfmake). </p>
  
  <p>In mobile Safari a user can open this PDF and view it natively, but when they go to share it by email the message inserts the entire base64 encoded URL for the PDF into the email and it quickly becomes unwieldy. </p>
  
  <p>What workaround do I need to do to stop it from doing that? Is there not some way to specify a default message (perhaps in some meta data) when a user goes to share a document by email?</p>
  
  <p>Currently the user experience is unacceptable because a user has to delete the entire base64 URL before they send their message, which is several pages long.</p>
  
  <p>I would rather not have to send the PDF to a server first to get a smaller URL. </p>