This tutorial is a fix if you're getting the connection not private message when you open a link from the Google app only. If you've just installed the filter and haven't installed certificates yet check out that tutorial from the CloudVeil docs. 

Hit the menu on the page where you're getting the connection not private error. Usually, this is in the top corner but may be in the bottom. 

Tap the Browser settings option.
If there is no Browser settings option in the menu then likely this is not an issue on your phone. Make sure you've installed certificates and contact CloudVeil support if the problem persists. 

Turn off the option to Open web pages in the Google app. 

Disable in-app browser in Google App