Main and patch expansion files must be in a particular location on the device for the application to read from them. If you Build and Run your application, Unity installs both the APKThe Android Package format output by Unity. An APK is automatically deployed to your device when you select File > Build & Run. More info
See in Glossary and the main APK expansion file on the device.
If you instead want to install the application manually, or want to install a patch expansion file, you must use the ADBAn Android Debug Bridge (ADB). You can use an ADB to deploy an Android package (APK) manually after building. More info
See in Glossary utility to copy APK expansion files into the correct location on your device. For information on how to do this, refer to Testing file reads.
Note: The APK expansion file name must correspond to the format that Google requires. For more information, refer to expansion files.