Why is the WebPros Storage extension installed, but I cannot use it or activate its functionality in Plesk?

This feature is available with the following conditions:

• A separate WebPros Storage license is required and is not included with standard Plesk licenses.
• The WebPros Storage license is available only to Plesk partners. If you are a partner and would like to use this service, please contact your account manager for licensing details.
• If you already own a WebPros Storage add-on license, make sure the license key is installed and active on the Plesk server. Once the license is activated, the WebPros Storage functionality becomes available.
• In some cases, the extension may be installed even though no WebPros Storage license is assigned to the server. In this situation, the extension cannot be used until a valid license is installed.