Using move() function in user registration process after using make:auth Laravel 5.3

I've added a file upload (Profile picture) to the registration form which generated by the command 'make:auth' in Laravel 5.3 The problem is I get a string and not a file so I can't use the move() function to place the file where it should.

This is my form:

<form class="form-horizontal" role="form" method="POST" action="">

    

    {!! Form::file('profile_picture', null, ['class' => 'form-control']) !!}

    <div class="form-group">
        <input id="first_name" type="text" class="form-control" name="first_name" value="" placeholder="First name" required autofocus>
        @if ($errors->has('first_name'))
            <span class="help-block">
                <strong></strong>
            </span>
        @endif
    </div>

    <div class="form-group">
        <input id="last_name" type="text" class="form-control" name="last_name" value="" placeholder="Last name" required autofocus>
            @if ($errors->has('last_name'))
                <span class="help-block">
                    <strong></strong>
                </span>
            @endif
    </div>

    <button type="submit" class="btn btn-primary">Register</button>

</form>

This is my create user function:

protected function create(array $data)
    {
        $user = User::create([
            'email' => $data['email'],
            'first_name' => $data['first_name'],
            'last_name' => $data['last_name'],
            'password' => bcrypt($data['password']),
            'class' => $data['class'],
            'year' => $data['year'],
            'phone' => $data['phone']
        ]);
        $tags = $data['tags'];
        $user->tags()->sync($tags); //Pivot table of tags
        if($data['profile_picture']){
            $file = File::create(['name' => $data['profile_picture'] , 'user_id' => $user->id]);
            MOVE THE FILE WITH $file->move();
            $file->save();
            $user->files()->attach($file); //Pivot table of files
        }
        return $user;
    }

via Chebli Mohamed