Binary Data Storage - Seeking working example

Solved.

The important bit is that when you upload the content to Jive that the content type isn't mixed/multipart (aka form data), it is just the binary content.  That means you only send the Blob object and not a FormData object, and you set the content type to application/octet-stream.

// get a temp BDS token to POST the attachment
osapi.jive.binary.token({duration : 10, name : 'readme.txt', verb : 'POST'
}).execute(function(response) {

    // temp URL to POST the attachment
    var postUrl = response.url;

    // create a Blob (file-api) with the file content
    var blob = new Blob(["Hello World"], {type : 'text/plain'});
    // fd.append('file', blob, "readme.txt");

    // use the temp token to post the content with jQuery.
    // important: this is different from a upload, the content type isn't a mixed/multipart.
    $.ajax({
      url: postUrl,
      data: blob,
      processData: false,
      contentType: 'application/octet-stream',
      type: 'POST',
      success: function(data){

        // fetch a new BDS token to GET the attachment
        osapi.jive.binary.token({name: 'readme.txt', verb: 'GET'})
        .execute(function(response) {
     
            // temp URL to GET the attachment
            var getUrl = response.url;
         
            // create a new Discussion object and add the attachment URL
            var attachment = {doUpload: true, "url": getUrl};
            var discussion = {
                content: {type: 'text/html', text: 'A Document'},
                subject: 'Some Discussion',
                attachments: [attachment]};
         
            // use the JS API to create the Discussion and attachment
            osapi.jive.corev3.discussions.create(discussion)
            .execute(function (response) { console.log(response); });

        });
     
      }
    });
});