code: function(id, params){
          var len = this._queue.push(id);
  
          var copy = {};        
          qq.extend(copy, params);
          this._params[id] = copy;        
                  
          // if too many active uploads, wait...
          if (len <= this._options.maxConnections){               
              this._upload(id, this._params[id]);
          }
      }
docs: Sends the file identified by id and additional query params to the server