The SOAP Request editor provides a tab Attachments to edit, update and delete attachments
Click with your mouse on the button Create new attachment. This will open a new dialog.
Enter the name (e.g. invoice) and confirm with OK. This will create a new attachment as in the screenshot above.
Click with your mouse on the button Load from disc to insert the local file contents. In the screenshot this is an invoice that should be sent with request to test an upload functionality.
The content is - if supported - in the content preview
The builtin attachments preview supports:
If the content type is different, no preview is shown, the attachment will still be sent with the request.
If you want to reference the attachment in the request editor, click with your mouse on the button Copy to Pasteboard. The Pasteboard will contain a string like so:
$(Attachment.CID:8FD11DF7-5DE5-49FD-A6A8-D1C7B1DB6A83@apijockey.com).
You can copy this text in any element like in the screenshot for the element msg:Data