Flarum\Foundation\Application::useStoragePath PHP Method

    public function useStoragePath($path)
    {
        $this->storagePath = $path;
        $this->instance('path.storage', $path);
        return $this;
    }

 /**
  * @return Application
  */
 protected function getApp()
 {
     if ($this->app !== null) {
         return $this->app;
     }
     date_default_timezone_set('UTC');
     $app = new Application($this->basePath, $this->publicPath);
     if ($this->storagePath) {
         $app->useStoragePath($this->storagePath);
     }
     $app->instance('env', 'production');
     $app->instance('flarum.config', $this->config);
     $app->instance('config', $config = $this->getIlluminateConfig($app));
     $this->registerLogger($app);
     $this->registerCache($app);
     $app->register('Flarum\\Database\\DatabaseServiceProvider');
     $app->register('Flarum\\Settings\\SettingsServiceProvider');
     $app->register('Flarum\\Locale\\LocaleServiceProvider');
     $app->register('Illuminate\\Bus\\BusServiceProvider');
     $app->register('Illuminate\\Filesystem\\FilesystemServiceProvider');
     $app->register('Illuminate\\Hashing\\HashServiceProvider');
     $app->register('Illuminate\\Mail\\MailServiceProvider');
     $app->register('Illuminate\\View\\ViewServiceProvider');
     $app->register('Illuminate\\Validation\\ValidationServiceProvider');
     if ($app->isInstalled() && $app->isUpToDate()) {
         $settings = $app->make('Flarum\\Settings\\SettingsRepositoryInterface');
         $config->set('mail.driver', $settings->get('mail_driver'));
         $config->set('mail.host', $settings->get('mail_host'));
         $config->set('mail.port', $settings->get('mail_port'));
         $config->set('mail.from.address', $settings->get('mail_from'));
         $config->set('mail.from.name', $settings->get('forum_title'));
         $config->set('mail.encryption', $settings->get('mail_encryption'));
         $config->set('mail.username', $settings->get('mail_username'));
         $config->set('mail.password', $settings->get('mail_password'));
         $app->register('Flarum\\Core\\CoreServiceProvider');
         $app->register('Flarum\\Api\\ApiServiceProvider');
         $app->register('Flarum\\Forum\\ForumServiceProvider');
         $app->register('Flarum\\Admin\\AdminServiceProvider');
         foreach ($this->extendCallbacks as $callback) {
             $app->call($callback);
         }
         $app->register('Flarum\\Extension\\ExtensionServiceProvider');
     }
     $app->boot();
     $this->app = $app;
     return $app;
 }