Minor work around

Assets/Darkmatter/Code/Editor.meta

@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: 2a01b1f301d474e39808b73160a98677
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/Darkmatter/Code/Editor/AddSelectedPrefabToPaperRoot.cs

@@ -0,0 +1,78 @@
+using UnityEditor;
+using UnityEditor.SceneManagement;
+using UnityEngine;
+using UnityEngine.SceneManagement;
+
+namespace Darkmatter.EditorTools
+{
+    public static class AddSelectedPrefabToPaperRoot
+    {
+        [MenuItem("Tools/Colorbook/Add Selected Prefab To PaperRoot")]
+        private static void AddSelected()
+        {
+            var prefab = Selection.activeObject as GameObject;
+            if (prefab == null || PrefabUtility.GetPrefabAssetType(prefab) == PrefabAssetType.NotAPrefab)
+            {
+                EditorUtility.DisplayDialog(
+                    "Select a prefab",
+                    "Select a drawing, coloring, or animation prefab in the Project window first.",
+                    "OK");
+                return;
+            }
+
+            var paperRoot = FindPaperRoot();
+            if (paperRoot == null)
+            {
+                EditorUtility.DisplayDialog(
+                    "PaperRoot not found",
+                    "Open the Gameplay scene and make sure it contains an object named PaperRoot.",
+                    "OK");
+                return;
+            }
+
+            var instance = PrefabUtility.InstantiatePrefab(prefab, paperRoot.scene) as GameObject;
+            if (instance == null) return;
+
+            Undo.RegisterCreatedObjectUndo(instance, $"Add {prefab.name} to PaperRoot");
+            Undo.SetTransformParent(instance.transform, paperRoot.transform, "Parent prefab to PaperRoot");
+
+            if (instance.transform is RectTransform rectTransform)
+            {
+                rectTransform.anchorMin = Vector2.zero;
+                rectTransform.anchorMax = Vector2.one;
+                rectTransform.anchoredPosition = Vector2.zero;
+                rectTransform.sizeDelta = Vector2.zero;
+                rectTransform.localScale = Vector3.one;
+            }
+            else
+            {
+                instance.transform.localPosition = Vector3.zero;
+                instance.transform.localRotation = Quaternion.identity;
+                instance.transform.localScale = Vector3.one;
+            }
+
+            Selection.activeGameObject = instance;
+            EditorSceneManager.MarkSceneDirty(paperRoot.scene);
+        }
+
+        [MenuItem("Tools/Colorbook/Add Selected Prefab To PaperRoot", true)]
+        private static bool ValidateAddSelected()
+        {
+            return !EditorApplication.isPlayingOrWillChangePlaymode;
+        }
+
+        private static GameObject FindPaperRoot()
+        {
+            var activeScene = SceneManager.GetActiveScene();
+            foreach (var root in activeScene.GetRootGameObjects())
+            {
+                var transforms = root.GetComponentsInChildren<Transform>(true);
+                foreach (var candidate in transforms)
+                    if (candidate.name == "PaperRoot")
+                        return candidate.gameObject;
+            }
+
+            return null;
+        }
+    }
+}

Assets/Darkmatter/Code/Editor/AddSelectedPrefabToPaperRoot.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 675d955c682824cd9904fb2e96517df1

ProjectSettings/ProjectSettings.asset

@@ -795,7 +795,7 @@ PlayerSettings:
   webEnableSubmoduleStrippingCompatibility: 0
   scriptingDefineSymbols:
     Android: SENTIS_ANALYTICS_ENABLED;APP_UI_EDITOR_ONLY
-    Standalone: SENTIS_ANALYTICS_ENABLED
+    Standalone: SENTIS_ANALYTICS_ENABLED;APP_UI_EDITOR_ONLY
     iPhone: SENTIS_ANALYTICS_ENABLED;APP_UI_EDITOR_ONLY
   additionalCompilerArguments: {}
   platformArchitecture: {}