As a Control Room Administrator you can add file extensions to the configuration file that restricts the user from uploading files that have extensions other than the ones which are on the trusted list.

1. Log in to the Control Room as an administrator.
2. Navigate to Administration > Settings > Client application.
3. Click the Edit option.
   The page opens in edit mode.
4. Select Only listed extensions option.
5. Enter the file extension to trusted list in the Whitelisted file extensions text box and click Add.
6. Scroll up and click Save changes.