IPostGenerateGradleAndroidProject to replace the instal location to "auto" in the generated AndroidManifest - Unity 2022.x

CustomGradleProcessor.cs

using System.IO;
using UnityEditor;
using UnityEditor.Android;
using UnityEngine;

/// <summary>
/// Used as a workaround for Unity 2022.x who isn't able to set the installlocation value to "auto" in the AndroidManifest.xml file.
/// Should be put in the Assets/Editor folder, otherwise you'll get errors on build.
/// The issue can be followed here : https://issuetracker.unity3d.com/issues/android-install-location-changes-when-exporting-project
/// </summary>
class CustomGradleProcessor : IPostGenerateGradleAndroidProject
{
    public int callbackOrder { get { return 0; } }
    public void OnPostGenerateGradleAndroidProject(string path)
    {
        Debug.Log("CustomGradleProcessor.OnPostGenerateGradleAndroidProject at path " + path);

        // Dirty hack to get the path to the AndroidManifest.xml file
        path = path.Replace("unityLibrary", "launcher\\src\\main\\AndroidManifest.xml");

        // Read the AndroidManifest.xml file and replace the preferExternal value
        string text = File.ReadAllText(path);
        text = text.Replace("preferExternal", "auto");

        // Write it all back
        File.WriteAllText(path, text);

        Debug.Log($"preferExternal replaced at {path}");
    }
}

Thanks for posting this! I got here from the Unity issue tracker and this is exactly what I needed without having to do another Unity upgrade.

It works! You saved my bacon, thanks so much!