this is never used anywhere

Author: mikk150

src/DropboxFilesystem.php

@@ -22,14 +22,11 @@ class DropboxFilesystem extends Filesystem
      * @var string
      */
     public $token;
-    /**
-     * @var string
-     */
-    public $app;
+
     /**
      * @var string|null
      */
-    public $prefix;
+    public $prefix = '';
 
     /**
      * @inheritdoc
@@ -40,10 +37,6 @@ public function init()
             throw new InvalidConfigException('The "token" property must be set.');
         }
 
-        if ($this->app === null) {
-            throw new InvalidConfigException('The "app" property must be set.');
-        }
-
         parent::init();
     }