The id of the attachment file in the Proposales database
What type of file the attachment represents. It can be
application/pdf for a PDF file, or text/html for a URL.A short, descriptive text to be shown as the title for the attachment.
Present for
text/html attachments. Contains the direct URL to link to. When this field is present, the attachment displays as a link without file upload.Present for PDF attachments. The UUID under which the file contents are saved in Proposales hosting. When this field is present, the attachment links to the uploaded file.