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.

Adding team members to your Unity Project

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

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

Plugin Inspector - Unity Manual

iOS Player settings - Other settings - Unity Manual

PC, Mac & Linux Standalone build settings - Unity Manual

Unity - Manual: Inside the Android Build Process

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Unity Manual (Printable)

Публикация сборок - Unity Manual

Unity Manual (Printable)

How to install an app from App Center, Play Store or using an APK