We have been able to use Google Search to find files or anything on the phone, even in apps, although now we receive an update that power this same as announced by Google from its own blog for a feature called Google in Apps.
Google announced last night that a new "In Apps" section will now be available located in the search bar that will allow showing results obtained from the apps you have installed, such as contact information, specific messages, music, videos and notes. Google also clarified that, in this case, the search occurs on the phone instead of the cloud, so it can work perfectly offline or offline.
In apps we could see it in one of the images shared about the LG V20 as the first phone to be released by a manufacturer with Android 7.0 Nougat. It is this same phone that will have a direct access to In Apps on the desktop and a single second screen. So by the time this update hits your phone, you can expect to see results from Gmail, Spotify, and YouTube for now, with Facebook, Messenger, LinkedIn, Evernote, Glide, Todoist, and Google Keep very soon.
Anyway, you also have the option to launch the Google app to find the tab located at the top. It also can control which apps are you want their search results to appear, so it will be up to you to skip some, while leaving the way to others.
Una simple and interesting feature that will allow you to quickly find information on your phone. It will depend on the third-party developers themselves who offer this functionality so that you can activate the app from the Google settings, or deactivate it where appropriate.