The GOOGLE DRIVE apps for iOS and Android are almost identical, but the Android version has an additional trick. When you create a new project on Google Drive for Android, you have the option of scanning a document with your smartphone camera and converting it to a PDF. Then, you can search for the text within that document using Drive’s search tool.
Steps for scanning documents using Google Drive:
Step 1: Open the Google Drive app on Android. The scanning feature isn’t available on iOS or the desktop version.
Step 2: Tap the “+” button on the bottom right of the screen to create a new project.
Step 3: Select “Scan” from the pop-up menu. This will launch the camera.
Step 4: Take a picture of your printed document. Keep in mind it must be typewritten or printed from a computer for the text to be searchable within Google Drive.
Step 5: After taking the photo, tap the checkmark to save to your Drive, the redo icon to shoot a better shot, and the plus button to add another scanned page to the file.
Step 6: Once you tap the checkmark, the scanned document will save to your Drive, and its text will be searchable using the main Google Drive search box.
References:
https://www.wired.com/2016/04/scan-search-pdfs-google-drive-android/
https://support.google.com/drive/answer/3145835?hl=en&co=GENIE.Platform%3DAndroid&oco=2
https://www.gtricks.com/drive/ocr-scanning-documents-drive-mobile-app/