A request or response can contain one attachment.

The attachment must be a text file and use the UTF-8 code page or a code page that is a subset of the UTF-8 code page.

To pass an attachment through requests or responses, you must connect all ports in the attachment group.

If a definition in the mapping contains an attachment group, but you do not want to send or receive attachments, do not connect any of the ports in the group.

If you receive messages from other sources, and each message contains an attachment, use a Sequence Generator transformation to generate a unique index for each attachment you send in a response.

To send or receive an attachment, use a toolkit that supports MIME attachments to create the client application.