capabilities are set in wrong order

[aWuttig]

instead of setting capabilities within the initializeAction you should to it like in LocalDriver and set the capabilities in the constructor. Otherwise uncheck the checkbox in file storage record doesn`t affect the cap check.

/**
     * @param array $configuration
     */
    public function __construct(array $configuration = [])
    {
        parent::__construct($configuration);
        // The capabilities default of this driver. See CAPABILITY_* constants for possible values
        $this->capabilities =
            ResourceStorage::CAPABILITY_BROWSABLE
            | ResourceStorage::CAPABILITY_PUBLIC
            | ResourceStorage::CAPABILITY_WRITABLE;
    }

/**
     * @return void
     */
    public function initialize()
    {
        $this->initializeBaseUrl()
            ->initializeSettings()
            ->initializeClient();
    }