How to save to userStorage in a conversation?

[bilogic]

I'm able to interact with botman over telegram for both i'm xxx and /who, but userStorage can't seem to save. Any idea why?

<?php

namespace App\Http\Controllers;

use BotMan\BotMan\BotMan;
use BotMan\BotMan\BotManFactory;
use BotMan\BotMan\Cache\LaravelCache;
use BotMan\BotMan\Drivers\DriverManager;
use BotMan\Drivers\Telegram\TelegramContactDriver;
use BotMan\Drivers\Telegram\TelegramDriver;
use BotMan\Drivers\Telegram\TelegramLocationDriver;
use BotMan\Drivers\Telegram\TelegramPhotoDriver;
use Illuminate\Http\Request;

class TelegramController extends Controller
{
    public function index(Request $request)
    {
        DriverManager::loadDriver(TelegramDriver::class);
        DriverManager::loadDriver(TelegramPhotoDriver::class);
        DriverManager::loadDriver(TelegramLocationDriver::class);
        DriverManager::loadDriver(TelegramContactDriver::class);

        $config = [
            'telegram' => [
                'token' => 'xxx',
            ],
        ];

        $botman = BotManFactory::create($config, new LaravelCache);

        $botman->hears("i'm (.*)", function (BotMan $bot, $name = '') {
            $bot->reply("HI $name.");
            $bot->userStorage()->save(['name' => $name]);
        });

        $botman->hears('/who', function (BotMan $bot) {
            $string = $bot->userStorage()->get('name');
            $bot->reply("you are $string"); // why is $string always empty?
        });

        $botman->listen();

        return response()->noContent();
    }
}

[bilogic]

I realized I need to specify the path for FileStorage and provide it as the 4th option to BotManFactory::create