Where does the Google app save downloaded images?
If you can't locate your images that you download from the Google app, check to make sure that your app storage permissions are enabled on your device.
You may also wish to check other apps including Gallery and Chrome.
You can also tap "See all apps with this permission". Here you can check the list of apps that have storage permissions allowed and denied. Check to see if there is an app in the "denied" list that is blocked.