fishnet installed

Assets/FishNet/Runtime/Utility/Editor/SceneDrawer.cs

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+#if UNITY_EDITOR
+using UnityEditor;
+using UnityEngine;
+
+namespace FishNet.Utility.Editing
+{
+    /* Source https://forum.unity.com/threads/how-to-link-scenes-in-the-inspector.383140/ */
+
+    [CustomPropertyDrawer(typeof(SceneAttribute))]
+    public class SceneDrawer : PropertyDrawer
+    {
+        public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
+        {
+            if (property.propertyType == SerializedPropertyType.String)
+            {
+                SceneAsset sceneObject = AssetDatabase.LoadAssetAtPath<SceneAsset>(property.stringValue);
+
+                if (sceneObject == null && !string.IsNullOrEmpty(property.stringValue))
+                {
+                    // try to load it from the build settings for legacy compatibility
+                    sceneObject = GetBuildSettingsSceneObject(property.stringValue);
+                }
+                if (sceneObject == null && !string.IsNullOrEmpty(property.stringValue))
+                {
+                    Debug.Log($"Could not find scene {property.stringValue} in {property.propertyPath}, assign the proper scenes in your NetworkManager");
+                }
+                SceneAsset scene = (SceneAsset)EditorGUI.ObjectField(position, label, sceneObject, typeof(SceneAsset), true);
+
+                property.stringValue = AssetDatabase.GetAssetPath(scene);
+            }
+            else
+            {
+                EditorGUI.LabelField(position, label.text, "Use [Scene] with strings.");
+            }
+        }
+
+        protected SceneAsset GetBuildSettingsSceneObject(string sceneName)
+        {
+            foreach (EditorBuildSettingsScene buildScene in EditorBuildSettings.scenes)
+            {
+                SceneAsset sceneAsset = AssetDatabase.LoadAssetAtPath<SceneAsset>(buildScene.path);
+                if (sceneAsset != null && sceneAsset.name == sceneName)
+                {
+                    return sceneAsset;
+                }
+            }
+            return null;
+        }
+    }
+}
+#endif

Assets/FishNet/Runtime/Utility/Editor/SceneDrawer.cs.meta

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