Laravel 5 File Uploading Not Working

Im new to the laravel 5.4.but i have to create file uploading system.if it is a PDF files,and other documents 1,Upload them seperatly 2, delete or download it them seperatly. as im new to laravel .i started like this can anyone help me to function it properly?

here is my UploadController

   class UploadController extends Controller
{
    public function index(){

        return view('upload.index');
    }

    public function multiple_upload(){

        $files = Input::file('images');
        $extention = $file ->getClientOriginalExtention();
        $entry = new Uploads();
        $entry -> mime = $files ->getClientMimeType();
        $entry -> filename = $files ->getFilename().'.'.$extention;
        $entry -> save();
    }
}

Here Is my Routes

Route::get('upload', 'UploadController@index');
Route::post('upload/uploadFiles', 'UserController@multiple_upload');

Here Is my View index.blade.php

 <form action="upload" id="upload" enctype="multipart/form-data" >
                <label>Uplod your Attachments</label>

                    <input type="file" name="file[]" multiple="" >
                    <input type="submit" >

                </form>

Here Is My Migration

 Schema::create('upload_3a12', function (Blueprint $table) {
        $table->increments('id');
        $table->string('filename'); 
        $table->string('mime');
        $table->timestamps();
    });

Hope You will help me lot. Thank you.

via Dasun