Create a File Property
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The File property type supports transferring of files such as documents, photos, or signatures. This means, you can upload MIME types such as .gif, .jpg, .pdf, .mpeg, .zip, html, .wav, or .doc files for activities.
Note: You can create a string property if you want to
                         include free text boxes, URLs, phone numbers, and email addresses. For more
                         information, refer to Create and Format a String Property.