With the Cisco Webex Teams integration with GIPHY, users can share PG-rated animated GIFs from the GIPHY library. You can disable this integration to prevent users from using it. Users can continue to copy animated GIFs from other applications and paste these animated GIFs into the Webex Teams apps.
From the customer view in https://admin.webex.com, go to Services and on the Message card click Settings.
Scroll to Collaboration Restrictions and toggle Share Animated GIFs to off.