Thanks for your update.
We have validated your problem in the reported scenario. We could able to get the postedFile and filename in controller. Please find the screenshot below,
However, if want to redirect into view when you click the submit, you can redirect from the controller by using the below code,
Please revert to us if we misunderstood your requirement. If yes, kindly share more details about your issue. So that we can quickly provide prompt solution at our end.