Welcome to Android Central! Are you using the Google search app, or the Google website on your browser? If you used the Google search app (and not Chrome) to download an image, you have to make sure the Google app's Storage permission is turned on (it defaults to off for some odd reason). If Storage permission is off, files go to a protected system directory called /document that can only be accessed by the Google app. If Storage permission is on, then files go to the standard /Download directory that the user can easily access.
Go to
Settings>Apps, select the Google app, tap Permissions, then turn on Storage permission.
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https://forums.androidcentral.com/ask-question/409154-join-android-central-community.html