code: public function from($provider = null)
      {
          $provider = $provider ?: $this->getDefaultProvider();
  
          return new Uploader(
              $this->app->make('config'), $this->app->make('filesystem'), $this->createProviderInstance($provider)
          );
      }
docs: Specify where the file is provided.
  
  @param  string|null  $provider
  @return \Rymanalu\LaravelSimpleUploader\Contracts\Uploader