code: function createForm(id, iframe) {
          var params = options.paramsStore.get(id),
              method = options.method.toLowerCase() === "get" ? "GET" : "POST",
              endpoint = options.endpointStore.get(id),
              name = getName(id);
  
          params[options.uuidName] = getUuid(id);
          params[options.filenameParam] = name;
  
          return handler._initFormForUpload({
              method: method,
              endpoint: endpoint,
              params: params,
              paramsInBody: options.paramsInBody,
              targetName: iframe.name
          });
      }
docs: Creates form, that will be submitted to iframe