Support for APK expansion files (OBB) - Unity Manual

APK expansion files are used as a solution for the 100MB app size limit in the Google Play Store. If your app is larger than 100MB (which is quite likely for a big game), you have to split your output package into the main part (APK) and the expansion file (OBB). Refer to the Android Developer documentation on expansion files for more information.

Manually copying Unity's APK and OBB files to an Android device for

android - Selecting/Uploading Obb file in new Developer Console

Unity3D – Reducing the APK file size of your build for mobile

Unity - Manual: Reducing the file size of your build

Searching Project Assets - Unity Manual

Codeless IAP

Sprite Editor: Custom Outline

Model tab - Unity Manual

ShurikenUnity/Assets/Wwise/Documentation