message: Fixed - survey-knockout + jQuery - drag file(s) over a file question causes the error
diff: @@ -46,7 +46,10 @@ class QuestionFileImplementor extends QuestionImplementor {
  event.returnValue = false;
  return false;
  }
  - event.dataTransfer.dropEffect = "copy";
  + let dataTransfer = event.originalEvent
  + ? event.originalEvent.dataTransfer
  + : event.dataTransfer;
  + dataTransfer.dropEffect = "copy";
  event.preventDefault();
  });
  this.setCallbackFunc("dochange", (data: any, event: any) => {
  