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.

Unity - Manual: Native (C++) plug-ins for Android

Chorus Apk Get File - Colaboratory

java - Downloading Unity .obb content via Android app - Stack Overflow

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

Unity - Manual: Build Settings

Android Development: APK Expansion Files in Android with Example

Unity - Manual: Inside the Android Build Process

Publish an APK with OBB in Unity

Google Play Asset Delivery Reference

Building and publishing a VR Unity game for Oculus with Codemagic

Big (up to 4GB) Expansion File Support how? - Meta Community