Adding attachments with no WSDL

Hi,

I am trying to send attachments to requests, but they are not being sent. I have read online you no longer need to import a WSDL for this, however all references to this, on pages like the one below, have a section where properties relating to the attachment are handled. I cannot find this on the attachments tab or anywhere else in the program and the Part drop down is empty

http://www.soapui.org/SOAP-and-WSDL/add ... ments.html

Does anyone have any idea what I need to do?

I am testing different MIME types and need to check that the following files can be sent to a service

OctetStream : 'application/octet-stream',
Json: 'application/json',
Xml: 'application/xml',
Zip: 'application/zip',
Xgzip: 'application/x-gzip',
Pdf: 'application/pdf',
Msword: 'application/msword',
Rtf: 'text/rtf',
Tiff: 'image/tiff',
Bmp: 'image/bmp',
Gif: 'image/gif',
Png: 'image/png',
Jpeg: 'image/jpeg',
Text: 'text/plain',
Html: 'text/html'
Thanks,

David