I'm assuming that you're doing common single uploads, that the form is for a record that has an attachment attribute. If you followed the "Quick start" section of the README, you have two attachment fields: a file field and a hidden field, which goes before the file field.
Then you don't send any additional AJAX requests (other than the ones required for direct upload), so instead of
this code you just write the JSON data to the hidden field:
var $hiddenInput = $(data.fileInput).prev();
$hiddenInput.val(JSON.stringify(image));
I haven't tested the above code, but it should work. Then when you submit the form, the uploaded file represented by this data will be attached to the record.
Kind regards,
Janko