Undefined variable: request - Laravel 5.1

I have include this on top of my file

use Request;

and also,

use Illuminate\Http\Request;

---

When I tried use

$files = $request->file('images');
dd($files);

I kept getting

ErrorException in PortfolioController.php line 113: Undefined variable: request

Why ?

According to the doc of 5.1

https://laravel.com/docs/5.1/requests

use Illuminate\Http\Request;

should be enough.

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