I received the following message running an Android/APK build recently…

OBB exceeds 2 GiB limit: 3465612638 bytes

There is some good documentation on Epic’s site as a starting point for resolving this…

Reducing APK Package Size | Unreal Engine Documentation

To ensure that only the content that is related to your project is added to your APK file, you can check which content is being added to your project’s APK by looking in the Cooked folder in your project. You can find the Cooked folder by going to (ProjectName)\Saved\Cooked and then choose the folder with the format you cooked your project for.