App Groups allow your iOS apps to share files locally - they behave like any other local paths that you are working with, as long as your App has the App Groups Entitlement. You can read more about App Groups Entitlements in Apple's official documentation

1. Open the Unity Package Manager and add a package from git URL

2. Paste this Repository's git URL

https://github.com/Eisenhuth/unity-appgroups.git

var appGroupPath = Plugins.iOS.AppGroupPlugin.GetAppGroupPath("YOUR.GROUP.IDENTIFIER");

Add the App Group Entitlement to the Xcode Project that Unity generates.

Editor -> Add Capability -> App Groups

You might have to add the capability to your App's identifier through the developer portal.