From the customer view in https://admin.webex.com, go to Organization settings.


Scroll to Network location and enter your IP addresses or ranges.


You must ensure that you enter your external internet IP ranges or addresses that you want to allow for file sharing.


Go to Services and on the Message card click Settings.


Scroll to Collaboration Restrictions and turn on the toggle Restrict file sharing to your network only.

IP range or address-based restrictions only apply to file upload, preview, download and to whiteboards and annotations.

IP range or address-based restriction does not apply to sharing animated GIFs and previews for shared links.