The Team Files app needs access to an external URL to work correctly. This is essential to enable the Microsoft 365 Web apps, allowing you to preview and edit documents in Confluence Server/DataCenter with the Team Files app. If your server and/or your Confluence instance are configured to have limited access to external URLs, you’ll need to add the Team Files URL to the whitelist.
Add to your firewall’s whitelist
To add the Team Files URL to the whitelist:
Open your server’s or network’s management setup;
Go to the firewall configuration;
Add
https://confluence.teamfiles.appto the whitelist.