Is it possible to update Version and Bundle number automatically?

Unity Engine
2

I did something similar recently (for cloud build but should work locally too). It calls a function in ‘pre-export’ that will set your build number before the build begins. It gets the build number from a free web service called https://increment.build. Just put your game code below (in the part marked INSERT_ID_HERE). The web service just gives you back an ever increasing number each time you call it.

#if UNITY_EDITOR
using UnityEditor;
using UnityEngine;
using UnityEditor.Callbacks;
using UnityEditor.Build;
using System;
using System.IO;
using UnityEngine.Networking;

/*     This class will increment the iOS build number on each build - this is useful for uploading builds
    to TestFlight (iOS) as it requires a more recent build number on each iteration */
public class IncrementBuildNumber : IPreprocessBuild
{
    public int callbackOrder { get { return 0; } }
    public void OnPreprocessBuild(BuildTarget target, string path)
    {
        string build = PlayerSettings.Android.bundleVersionCode.ToString();
       
        // Retrieve auto-incrementing build number from server service
        UnityWebRequest www = UnityWebRequest.Get( "https://increment.build/***INSERT_ID_HERE***" );
        www.SendWebRequest();
        while( www.isDone == false )
        {
        }
        if( (www.isNetworkError) || (string.IsNullOrEmpty( www.downloadHandler.text )) )
        {
            Debug.LogErrorFormat( "Error retrieving auto-increment build number:" + www.error );
        }
        else
        {
            Debug.LogFormat( "Retrieved auto-increment build number:" + www.downloadHandler.text );
            //Debug.Log( www.downloadHandler.text );
            build = www.downloadHandler.text;
        }
        PlayerSettings.bundleVersion = "1.0";
        PlayerSettings.iOS.buildNumber = build;
        try
        {
            PlayerSettings.Android.bundleVersionCode = Convert.ToInt32( build );
        }
        catch
        {
            Debug.LogErrorFormat( "Error converting auto-increment build number to an integer: {0}" , build );
        }
    }
}
#endif