One of the great things about your Faxing Tool is that supporters can easily add images to their faxes. All hail the magic of audio-frequency tone-based bitmapping!
You can allow users to upload an image to their fax message under the Target Content section of your tool Content screen:
All uploaded images must be less than 20 MB, and in gif, png, jpg, or jpeg format.
Once you've enabled image uploading, the upload button will appear below the Your Letter field on you Faxing Tool, looking a little something like this: