We don't currently support file attachment on a proposal. However, you can add a link to files on your engagement letter or personalized messages if you have the files uploaded on a website or on a file sharing site like Google Drive or Dropbox.

To add a link, wrap the link text with quotation marks (") and immediately follow it with a colon (:) and the file's URL.

Here's a "link to a file":http://practiceignition.com/file

This will appear in your editor like this:

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