Laravel Storage::extend not working - php

Question

I can't figure out where I'm going wrong, with this. I've followed the Laravel docs by installing spatie/flysystem-dropbox via composer copied the DropboxServiceProvider from the Laravel Docs, added the service provided to the config\app.php, ran composer dump autoload but yet I am still getting the following error message:
PHP error: Undefined index: driver in /***/vendor/laravel/framework/src/Illuminate/Filesystem/FilesystemManager.php on line 112
Here is the service provider:
<?php
namespace App\Providers;
use Storage;
use League\Flysystem\Filesystem;
use Spatie\Dropbox\Client as DropboxClient;
use Illuminate\Support\ServiceProvider;
use Spatie\FlysystemDropbox\DropboxAdapter;
class DropboxServiceProvider extends ServiceProvider
{
/**
* Perform post-registration booting of services.
*
* #return void
*/
public function boot()
{
Storage::extend('dropbox', function ($app, $config) {
$client = new DropboxClient(
$config['authorizationToken']
);
return new Filesystem(new DropboxAdapter($client));
});
}
/**
* Register bindings in the container.
*
* #return void
*/
public function register()
{
//
}
}
And here's my config/app/php:
...
/*
* Application Service Providers...
*/
App\Providers\AppServiceProvider::class,
App\Providers\AuthServiceProvider::class,
App\Providers\DropboxServiceProvider::class,
// App\Providers\BroadcastServiceProvider::class,
App\Providers\EventServiceProvider::class,
App\Providers\RouteServiceProvider::class,
...
Finally, here's my config/filesystems.php:
'dropbox'=>[
'authorizationToken'=>env('DROPBOX_ACCESS_TOKEN')
],

Answer 1

Turns out that I was missing the driver value in the config/filesystems/php so it should have been this:
'dropbox'=>[
'driver' => 'dropbox', <=== THIS WAS MISSING
'authorizationToken'=>env('DROPBOX_TOKEN')
],

Answer 2

One good Pacakge avilable for extend storage using dropbox:
detail documentation : https://github.com/GrahamCampbell/Laravel-Dropbox
steps for use this package :
1 : composer require graham-campbell/dropbox in your cmd window
2 : after this you have to register service provider for laravel dropbox,
go to config/app.php
and add 'GrahamCampbell\Dropbox\DropboxServiceProvider' this in provider array
and 'Dropbox' => 'GrahamCampbell\Dropbox\Facades\Dropbox' this to aliases array
3: now you have to publish pacakge so 'php artisan vendor:publish' run this in your cmd
- this will create dropbox.php file in your config in this file you have to add your credentials
4: here you have two option for connection you can use it according to your choice.
usage :
simple example :
use GrahamCampbell\Dropbox\Facades\Dropbox;
// you can alias this in config/app.php if you like
Dropbox::createFolder('Folder_Name');
// we're done here - how easy was that, it just works!
Dropbox::delete('Folder_Name');
// this example is simple, and there are far more methods available