There is no such extension. Because it is pointless. This functionality is created literally by adding fileinput in the form and then send its contents along with other data. You need to do is find a library that will be able to reflect on the contents of this climate of fileinput. Either the most such to write, it is not difficult. As a small but comprehensive manual on using this form element on the client:
https://developer.mozilla.org/ru/docs/Web/API/File...