Examples
Modify a previously attached CCD attachment:
var ccd = new XML(getAttachment(attachmentId, true).getContentString());
ccd.id.@root = 'testing';
updateAttachment(attachmentId, ccd.toString(), 'text/xml', true);
Read in a PDF from the filesystem and add it as an attachment:
var fileBytes = FileUtil.readBytes('/path/to/file.pdf');
// Pass in true for Base64Encode, since the content isn't already Base64 encoded
addAttachment(fileBytes, 'application/pdf', true);