init() {
        super.init(...arguments);
        this.total = this.file && this.file.size || 0;
    }
Result from a file upload
@typedef {Object} UploadResult
@property {string} fileName - file name, eg "my-image.png"
@property {string} url - url relative to Ghost root,eg "/content/images/2017/05/my-image.png"