added drag and drop script in test scene, needs to be implemented in main scene when building, for now we can do that it builds in a place but you can move it after

Assets/Game/Scenes/TestScene/Test.unity.meta

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Assets/Game/Scenes/TestScene/TestSceneScripts.meta

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Assets/Game/Scenes/TestScene/TestSceneScripts/DragAndDrop.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class DragAndDrop : MonoBehaviour
+{   
+    private float zCoord;
+    private Vector3 mouseOffset;
+    
+    private void onMouseDown()
+    {
+        zCoord = Camera.main.WorldToScreenPoint(transform.position).z;
+        mouseOffset = transform.position - mouseWorldPos();
+    }
+
+
+    private void onMouseDrag()
+    {
+        transform.position = mouseWorldPos() + mouseOffset;
+    }
+
+
+    private Vector3 mouseWorldPos()
+    {
+        Vector3 mPos = Input.mousePosition;
+        mPos.z = zCoord;
+        return Camera.main.ScreenToWorldPoint(mPos);
+    }
+}

Assets/Game/Scenes/TestScene/TestSceneScripts/DragAndDrop.cs.meta

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Assets/Game/Scenes/TestScene/TestSceneScripts/Grabber.cs

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+using UnityEngine;
+
+public class Grabber : MonoBehaviour {
+
+    private GameObject selectedObject;
+
+    private void Update() {
+        if (Input.GetMouseButtonDown(0)) {
+            if(selectedObject == null) {
+                RaycastHit hit = CastRay();
+
+                if(hit.collider != null) {
+                    if (!hit.collider.CompareTag("Drag")) {
+                        return;
+                    }
+
+                    selectedObject = hit.collider.gameObject;
+                    Cursor.visible = false;
+                }
+            } else {
+                Vector3 position = new Vector3(Input.mousePosition.x, Input.mousePosition.y, Camera.main.WorldToScreenPoint(selectedObject.transform.position).z);
+                Vector3 worldPosition = Camera.main.ScreenToWorldPoint(position);
+                selectedObject.transform.position = new Vector3(worldPosition.x, 0f, worldPosition.z);
+
+                selectedObject = null;
+                Cursor.visible = true;
+            }
+        }
+
+        if(selectedObject != null) {
+            Vector3 position = new Vector3(Input.mousePosition.x, Input.mousePosition.y, Camera.main.WorldToScreenPoint(selectedObject.transform.position).z);
+            Vector3 worldPosition = Camera.main.ScreenToWorldPoint(position);
+            selectedObject.transform.position = new Vector3(worldPosition.x, .25f, worldPosition.z);
+
+            if (Input.GetMouseButtonDown(1)) {
+                selectedObject.transform.rotation = Quaternion.Euler(new Vector3(
+                    selectedObject.transform.rotation.eulerAngles.x,
+                    selectedObject.transform.rotation.eulerAngles.y + 90f,
+                    selectedObject.transform.rotation.eulerAngles.z));
+            }
+        }
+    }
+
+    private RaycastHit CastRay() {
+        Vector3 screenMousePosFar = new Vector3(
+            Input.mousePosition.x,
+            Input.mousePosition.y,
+            Camera.main.farClipPlane);
+        Vector3 screenMousePosNear = new Vector3(
+            Input.mousePosition.x,
+            Input.mousePosition.y,
+            Camera.main.nearClipPlane);
+        Vector3 worldMousePosFar = Camera.main.ScreenToWorldPoint(screenMousePosFar);
+        Vector3 worldMousePosNear = Camera.main.ScreenToWorldPoint(screenMousePosNear);
+        RaycastHit hit;
+        Physics.Raycast(worldMousePosNear, worldMousePosFar - worldMousePosNear, out hit);
+
+        return hit;
+    }
+}

Assets/Game/Scenes/TestScene/TestSceneScripts/Grabber.cs.meta

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