How to call an action to controller without route which resides in a Package

I have an Application running in Laravel 5.2. I have created a custom file upload package. File upload functionality is being handled inside the controller of the pacakge. Now from my original App I want to submit a form which also will have an upload file button. I am trying to post the form such that only the upload file portion can be handled using the package controller action. How I will do this?

via Chebli Mohamed