Rename LoadScene/LoadSceneAdditive to LoadScenario/UnloadScenario

The old naming suggested UE level loading; what these calls actually do
is spawn actors described by a .pss scenario file into the already-loaded
UE level. Renamed for clarity:

  SceneLoader::LoadScene         -> LoadScenario
  SceneLoader::LoadSceneFromData -> LoadScenarioFromData
  SceneLoader::LoadSceneAdditive -> dropped (merged into LoadScenario)
  SceneLoader::UnloadSceneAdditive -> UnloadScenario
  SceneSerializer::LoadScene     -> LoadScenario
  AdditiveSpawnedActors          -> TrackedSpawnedActors

LoadScenario now branches on the filter: when Filter == PreloadOnly the
timeline subsystem is skipped entirely (no SetData, no ActorId
registration, no auto-play) so a briefing scene can drop in player
placement markers without disturbing its own timeline. All other filter
values keep the full gameplay behaviour (timeline + AI-readiness poll).

Every load tracks its actors so a follow-up UnloadScenario() can destroy
them — supports the briefing flow where the player toggles between
scenarios at runtime.

Breaking change for external BP callers: any node binding the old
LoadScene / LoadSceneAdditive / UnloadSceneAdditive functions will show
up as missing on next BP compile; replace with LoadScenario /
UnloadScenario (identical or simpler signatures).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.claude/memory/MEMORY.md

@@ -1,4 +1,4 @@
-- [PS_Editor plugin project](project_ps_editor.md) — Runtime editor plugin for UE 5.5, Phases 1-4 done, outline material pending
+- [PS_Editor plugin project](project_ps_editor.md) — Runtime editor plugin for UE 5.7 (migrated from 5.5 in April 2026), Phases 1-4 done, outline material pending
 - [Underscore naming](feedback_naming.md) — Always use PS_Editor_ prefix with underscores in file/class names
-- [UE5 build process](reference_build.md) — CLI build command for the project (Build.bat path, target name, flags)
+- [UE5 build process](reference_build.md) — CLI build command for PROSERVE_UE_5_7 (5.5 host deprecated), Build.bat path, target name, junction check
 - [Build workflow](feedback_build_workflow.md) — Prefer Live Coding (Ctrl+Alt+F11) when UE is open, CLI build only when UE is closed

.claude/memory/project_ps_editor.md

@@ -1,10 +1,10 @@
 ---
 name: PS_Editor plugin project
-description: Runtime editor plugin for UE 5.5 - object placement, scene editing, JSON save/load in packaged builds
+description: Runtime editor plugin for UE 5.7 - object placement, scene editing, JSON save/load in packaged builds
 type: project
 ---
 
-PS_Editor is a runtime editor plugin for Unreal Engine 5.5 for the PROSERVE project.
+PS_Editor is a runtime editor plugin for Unreal Engine 5.7 for the PROSERVE project. The plugin was started on UE 5.5; the host project migrated to UE 5.7 in April 2026 and the plugin follows. Build details in reference_build.md.
 
 Key decisions:
 - UI: UMG driven by C++ (Slate)

.claude/memory/reference_build.md

@@ -1,18 +1,30 @@
 ---
 name: UE5 build process
-description: How to build the PS_ProserveEditor UE 5.5 project from command line on Windows
+description: How to build the PROSERVE host project (currently UE 5.7) from command line on Windows
 type: reference
 ---
 
-UE 5.5 is installed at `C:\Program Files\Epic Games\UE_5.5` (found via registry key `HKLM\SOFTWARE\EpicGames\Unreal Engine\5.5`).
+The PS_Editor plugin is developed in `E:\ASTERION\GIT\PS_Editor\Unreal\Plugins\PS_Editor` and consumed by the PROSERVE host project via an NTFS junction. Always build the host project, not the plugin in isolation.
+
+**Current host project (April 2026):** `E:\ASTERION\SVN\DEV\PROSERVE_UE_5_7\PROSERVE_UE_5_7.uproject` (Unreal Engine 5.7)
+
+The previous 5.5 host (`PROSERVE_UE_5_5`) is deprecated — do not use unless explicitly asked.
+
+UE 5.7 is installed at `C:\Program Files\Epic Games\UE_5.7` (found via registry key `HKLM\SOFTWARE\EpicGames\Unreal Engine\5.7`).
 
 Build command (Editor target, Development):
 ```
-"C:/Program Files/Epic Games/UE_5.5/Engine/Build/BatchFiles/Build.bat" PS_ProserveEditorEditor Win64 Development -Project="C:/ASTERION/GIT/PS_ProserveEditor/Unreal/PS_ProserveEditor.uproject" -WaitMutex -FromMsBuild
+"C:/Program Files/Epic Games/UE_5.7/Engine/Build/BatchFiles/Build.bat" PROSERVE_UE_5_7Editor Win64 Development -Project="E:/ASTERION/SVN/DEV/PROSERVE_UE_5_7/PROSERVE_UE_5_7.uproject" -WaitMutex -FromMsBuild
 ```
 
-**How to apply:** Use this command to compile after code changes. Timeout should be set to 600000ms (10 min) for safety. The target name is `PS_ProserveEditorEditor` (Editor suffix) for editor builds.
+**How to apply:** Use this command to compile after code changes. Timeout should be set to 600000ms (10 min) for safety. The target name is `PROSERVE_UE_5_7Editor` (Editor suffix) for editor builds.
 
 **When to use CLI vs Live Coding:**
 - Live Coding (Ctrl+Alt+F11): .cpp only changes (no new UCLASS, USTRUCT, UENUM, UPROPERTY in headers)
 - Full CLI build (UE must be closed): new files, header changes with new reflected types, Build.cs changes
+
+**Plugin junction verification:**
+```
+ls -la E:/ASTERION/SVN/DEV/PROSERVE_UE_5_7/Plugins/ | grep PS_Editor
+```
+Should show a symlink pointing to `/e/ASTERION/GIT/PS_Editor/Unreal/Plugins/PS_Editor`. If broken, the host project will build against a stale or missing plugin copy.

CLAUDE.md

@@ -1,7 +1,7 @@
 # PS_ProserveEditor - Project Guidelines
 
 ## Project Overview
-Unreal Engine 5.5 project with runtime editor plugin (PS_Editor). The plugin enables runtime scene editing in packaged builds: object placement, property editing, scenario definition, splines, lighting, and JSON scene save/load.
+Unreal Engine 5.7 project with runtime editor plugin (PS_Editor). The plugin enables runtime scene editing in packaged builds: object placement, property editing, scenario definition, splines, lighting, and JSON scene save/load. The plugin was started on UE 5.5; the host project migrated to UE 5.7 in April 2026.
 
 ## Architecture
 - **Plugin**: PS_Editor (runtime plugin, must work in packaged builds)
@@ -118,14 +118,16 @@ Symptom that the wrong widget was edited: logs you added don't appear in the Out
   and wait. Don't pre-emptively write + apply the code change in the same turn.
 
 ## Build
-- Engine: Unreal Engine 5.5
-- Plugin location: `Unreal/Plugins/PS_Editor/`
-- Game module: `PS_ProserveEditor` (in `Unreal/Source/PS_ProserveEditor/`)
+- Engine: Unreal Engine 5.7 (host project migrated from 5.5 in April 2026)
+- Plugin location: `Unreal/Plugins/PS_Editor/` (consumed via NTFS junction from the PROSERVE host project's `Plugins/` directory)
+- Host project: `E:\ASTERION\SVN\DEV\PROSERVE_UE_5_7\PROSERVE_UE_5_7.uproject` — always build this, not the plugin in isolation
+- Game module: `PROSERVE_UE_5_7` (in the host project's `Source/`)
 - CLI build command (Editor, Development):
   ```
-  "<UE_INSTALL>/Engine/Build/BatchFiles/Build.bat" PS_ProserveEditorEditor Win64 Development -Project="<REPO>/Unreal/PS_ProserveEditor.uproject" -WaitMutex -FromMsBuild
+  "C:/Program Files/Epic Games/UE_5.7/Engine/Build/BatchFiles/Build.bat" PROSERVE_UE_5_7Editor Win64 Development -Project="E:/ASTERION/SVN/DEV/PROSERVE_UE_5_7/PROSERVE_UE_5_7.uproject" -WaitMutex -FromMsBuild
   ```
-  UE install path can be found via registry: `HKLM\SOFTWARE\EpicGames\Unreal Engine\5.5` > `InstalledDirectory`
+  UE install path can be found via registry: `HKLM\SOFTWARE\EpicGames\Unreal Engine\5.7` > `InstalledDirectory`
+- The 5.5 host (`PROSERVE_UE_5_5`) is deprecated — do not build against it unless explicitly asked.
 
 ## Project Memory
 Shared project memory is stored in `.claude/memory/` (versioned in the repository). When starting a new session on any machine, read these files to restore context:

Unreal/Plugins/PS_Editor/Source/PS_Editor/GameMode/PS_Editor_PlayerController.cpp

@@ -138,8 +138,8 @@ void APS_Editor_PlayerController::BeginPlay()
 
 					if (!Sub->PendingScenarioName.IsEmpty() && SpawnManager && SceneSerializer)
 					{
-						bool bLoaded = SceneSerializer->LoadScene(Sub->PendingScenarioName, SpawnManager);
-						UE_LOG(LogTemp, Log, TEXT("PS_Editor: LoadScene('%s') = %s"),
+						bool bLoaded = SceneSerializer->LoadScenario(Sub->PendingScenarioName, SpawnManager);
+						UE_LOG(LogTemp, Log, TEXT("PS_Editor: LoadScenario('%s') = %s"),
 							*Sub->PendingScenarioName, bLoaded ? TEXT("OK") : TEXT("FAILED"));
 					}
 					Sub->PendingScenarioName.Empty();

Unreal/Plugins/PS_Editor/Source/PS_Editor/Serialization/PS_Editor_SceneLoader.cpp

@@ -49,11 +49,13 @@ namespace
 	}
 }
 
-bool UPS_Editor_SceneLoader::LoadScene(const UObject* WorldContextObject, const FString& SceneName, TArray<AActor*>& OutActors, bool bStripEditorComponents, EPS_Editor_SceneLoadFilter Filter)
+TArray<TWeakObjectPtr<AActor>> UPS_Editor_SceneLoader::TrackedSpawnedActors;
+
+bool UPS_Editor_SceneLoader::LoadScenario(const UObject* WorldContextObject, const FString& ScenarioName, TArray<AActor*>& OutActors, bool bStripEditorComponents, EPS_Editor_SceneLoadFilter Filter)
 {
 	OutActors.Empty();
 
-	if (!WorldContextObject || SceneName.IsEmpty())
+	if (!WorldContextObject || ScenarioName.IsEmpty())
 	{
 		return false;
 	}
@@ -65,7 +67,7 @@ bool UPS_Editor_SceneLoader::LoadScene(const UObject* WorldContextObject, const
 	}
 
 	// Read JSON file
-	const FString FilePath = GetSceneFilePath(SceneName);
+	const FString FilePath = GetSceneFilePath(ScenarioName);
 	FString JsonString;
 	if (!FFileHelper::LoadFileToString(JsonString, *FilePath))
 	{
@@ -81,11 +83,22 @@ bool UPS_Editor_SceneLoader::LoadScene(const UObject* WorldContextObject, const
 		return false;
 	}
 
-	if (!LoadSceneFromData(World, SceneData, OutActors, Filter))
+	if (!LoadScenarioFromData(World, SceneData, OutActors, Filter))
 	{
 		return false;
 	}
 
+	// Track every spawned actor so UnloadScenario() can dispose of them later — this is the
+	// briefing-flow hook (load preload markers, then unload on scenario change). Gameplay
+	// callers that never unload don't pay a price beyond a small TWeakObjectPtr array.
+	for (AActor* Actor : OutActors)
+	{
+		if (Actor)
+		{
+			TrackedSpawnedActors.Add(Actor);
+		}
+	}
+
 	// Strip editor-only components for clean gameplay
 	if (bStripEditorComponents)
 	{
@@ -94,11 +107,6 @@ bool UPS_Editor_SceneLoader::LoadScene(const UObject* WorldContextObject, const
 			if (!Actor) continue;
 
 			TArray<UActorComponent*> ToRemove;
-			for (UActorComponent* Comp : Actor->GetComponentsByInterface(UPS_Editor_PointPlaceable::StaticClass()))
-			{
-				// Don't remove — PointPlaceable is on the actor itself, not a component
-			}
-
 			if (UActorComponent* Spawnable = Actor->FindComponentByClass<UPS_Editor_SpawnableComponent>())
 			{
 				ToRemove.Add(Spawnable);
@@ -124,7 +132,28 @@ bool UPS_Editor_SceneLoader::LoadScene(const UObject* WorldContextObject, const
 	return true;
 }
 
-bool UPS_Editor_SceneLoader::LoadSceneFromData(UWorld* World, const FPS_Editor_SceneData& SceneData, TArray<AActor*>& OutActors, EPS_Editor_SceneLoadFilter Filter)
+int32 UPS_Editor_SceneLoader::UnloadScenario(const UObject* WorldContextObject)
+{
+	int32 Destroyed = 0;
+	for (TWeakObjectPtr<AActor>& Weak : TrackedSpawnedActors)
+	{
+		if (AActor* Actor = Weak.Get())
+		{
+			Actor->Destroy();
+			++Destroyed;
+		}
+		// else: already gone (GC, manual destroy, level reload) — skip silently
+	}
+	TrackedSpawnedActors.Reset();
+
+	if (Destroyed > 0)
+	{
+		UE_LOG(LogTemp, Log, TEXT("PS_Editor SceneLoader: UnloadScenario destroyed %d actor(s)"), Destroyed);
+	}
+	return Destroyed;
+}
+
+bool UPS_Editor_SceneLoader::LoadScenarioFromData(UWorld* World, const FPS_Editor_SceneData& SceneData, TArray<AActor*>& OutActors, EPS_Editor_SceneLoadFilter Filter)
 {
 	if (!World)
 	{
@@ -144,7 +173,13 @@ bool UPS_Editor_SceneLoader::LoadSceneFromData(UWorld* World, const FPS_Editor_S
 	// Static nav is preserved on disk for scenarios that don't need this.
 	PS_Editor_NavUtils::SetDynamicNavigationEnabled(World, SceneData.bUseDynamicNavigation);
 
-	UPS_Editor_TimelineSubsystem* TimelineSS = World->GetSubsystem<UPS_Editor_TimelineSubsystem>();
+	// PreloadOnly is the briefing path: only player-placement markers / briefing props
+	// should spawn, and the briefing scene runs its OWN timeline (don't push the scenario's
+	// timeline data or auto-play it). Skip the timeline subsystem entirely in that case.
+	const bool bSkipTimeline = (Filter == EPS_Editor_SceneLoadFilter::PreloadOnly);
+	UPS_Editor_TimelineSubsystem* TimelineSS = bSkipTimeline
+		? nullptr
+		: World->GetSubsystem<UPS_Editor_TimelineSubsystem>();
 
 	int32 SpawnedCount = 0;
 
@@ -154,7 +189,8 @@ bool UPS_Editor_SceneLoader::LoadSceneFromData(UWorld* World, const FPS_Editor_S
 		AActor* SpawnedActor = SpawnActorFromData(World, ActorData, Filter);
 		if (SpawnedActor)
 		{
-			// Register the stable ID so timeline tracks can find this actor
+			// Register the stable ID so timeline tracks can find this actor.
+			// Only when timeline is active for this load (PreloadOnly skips the subsystem).
 			if (TimelineSS && ActorData.ActorId.IsValid())
 			{
 				TimelineSS->RegisterActorId(SpawnedActor, ActorData.ActorId);
@@ -220,8 +256,8 @@ bool UPS_Editor_SceneLoader::LoadSceneFromData(UWorld* World, const FPS_Editor_S
 		}
 	}
 
-	UE_LOG(LogTemp, Log, TEXT("PS_Editor SceneLoader: Loaded %d actors from scene '%s'"),
-		SpawnedCount, *SceneData.SceneName);
+	UE_LOG(LogTemp, Log, TEXT("PS_Editor SceneLoader: Loaded %d actor(s) from scenario '%s' [filter=%d]"),
+		SpawnedCount, *SceneData.SceneName, (int32)Filter);
 	return SpawnedCount > 0;
 }
 

Unreal/Plugins/PS_Editor/Source/PS_Editor/Serialization/PS_Editor_SceneLoader.h

@@ -5,7 +5,7 @@
 #include "Kismet/BlueprintFunctionLibrary.h"
 #include "PS_Editor_SceneLoader.generated.h"
 
-/** Filter for selective scene loading. */
+/** Filter for selective scenario loading. */
 UENUM(BlueprintType)
 enum class EPS_Editor_SceneLoadFilter : uint8
 {
@@ -15,20 +15,27 @@ enum class EPS_Editor_SceneLoadFilter : uint8
 };
 
 /**
- * Standalone scene loader for PS_Editor.
- * Loads a JSON scene file and spawns all actors with their properties and spline data.
+ * Standalone scenario loader for PS_Editor.
+ * A "scenario" is a .pss file describing actors + properties + timeline saved by the runtime
+ * editor. This loader spawns those actors into an already-loaded UE level — it does NOT
+ * change the current UE level. Spawning is additive: existing world content is preserved.
  *
  * This is the entry point for GAME MODE usage — it does NOT require
  * PS_Editor's PlayerController, SelectionManager, Gizmo, or UI.
- * Just call LoadScene() from your GameMode's BeginPlay.
+ * Just call LoadScenario() from your GameMode's BeginPlay.
  *
  * Usage:
  *   void AMyGameMode::BeginPlay()
  *   {
  *       Super::BeginPlay();
  *       TArray<AActor*> SpawnedActors;
- *       UPS_Editor_SceneLoader::LoadScene(GetWorld(), TEXT("MyScene"), SpawnedActors);
+ *       UPS_Editor_SceneLoader::LoadScenario(GetWorld(), TEXT("MyScenario"), SpawnedActors);
  *   }
+ *
+ * Briefing usage (player placement markers only, no timeline animation):
+ *   UPS_Editor_SceneLoader::UnloadScenario(this);
+ *   UPS_Editor_SceneLoader::LoadScenario(this, TEXT("MyScenario"), Out, true,
+ *       EPS_Editor_SceneLoadFilter::PreloadOnly);
  */
 UCLASS()
 class PS_EDITOR_API UPS_Editor_SceneLoader : public UBlueprintFunctionLibrary
@@ -37,56 +44,71 @@ class PS_EDITOR_API UPS_Editor_SceneLoader : public UBlueprintFunctionLibrary
 
 public:
 	/**
-	 * Load a scene from a JSON file and spawn all actors.
+	 * Load a scenario from a .pss file and spawn its actors into the current world.
 	 *
-	 * @param World                    The world to spawn actors into.
-	 * @param SceneName                Scene name (without .json extension).
-	 * @param OutActors                Filled with all spawned actors.
+	 * The call is additive — existing world content is preserved. Spawned actors are tracked
+	 * internally so UnloadScenario() can clean them up; this lets you switch scenarios at
+	 * runtime (typical briefing flow). When Filter == PreloadOnly, the timeline subsystem is
+	 * NOT touched (no SetData, no auto-play, no ActorId registration) so a briefing scene's
+	 * own timeline keeps running untouched.
+	 *
+	 * @param ScenarioName             Scenario name (without .pss extension).
+	 * @param OutActors                Filled with all spawned actors (also tracked internally).
 	 * @param bStripEditorComponents   If true, removes SpawnableComponent and EditableComponent after spawn (cleaner for gameplay).
-	 * @return                         True if the scene was loaded successfully.
+	 * @param Filter                   Which actors to spawn. PreloadOnly = briefing-only, skips timeline setup.
+	 * @return                         True if the scenario was loaded successfully.
 	 */
 	UFUNCTION(BlueprintCallable, Category = "PS_Editor", meta = (WorldContext = "WorldContextObject"))
-	static bool LoadScene(const UObject* WorldContextObject, const FString& SceneName, TArray<AActor*>& OutActors,
+	static bool LoadScenario(const UObject* WorldContextObject, const FString& ScenarioName, TArray<AActor*>& OutActors,
 		bool bStripEditorComponents = true, EPS_Editor_SceneLoadFilter Filter = EPS_Editor_SceneLoadFilter::All);
 
 	/**
-	 * Load scene from an already-parsed SceneData struct.
-	 * Useful if you want to parse the JSON yourself or modify data before spawning.
+	 * Destroy every actor previously spawned via LoadScenario(). No-op if nothing was loaded
+	 * or all tracked actors have already been GC'd / manually destroyed.
+	 * Call this before LoadScenario() when switching scenarios.
+	 * @return  Number of actors destroyed.
 	 */
-	static bool LoadSceneFromData(UWorld* World, const FPS_Editor_SceneData& SceneData, TArray<AActor*>& OutActors,
+	UFUNCTION(BlueprintCallable, Category = "PS_Editor", meta = (WorldContext = "WorldContextObject"))
+	static int32 UnloadScenario(const UObject* WorldContextObject);
+
+	/**
+	 * Load scenario actors from an already-parsed SceneData struct.
+	 * Useful if you want to parse the .pss JSON yourself or modify data before spawning.
+	 */
+	static bool LoadScenarioFromData(UWorld* World, const FPS_Editor_SceneData& SceneData, TArray<AActor*>& OutActors,
 		EPS_Editor_SceneLoadFilter Filter = EPS_Editor_SceneLoadFilter::All);
 
 	/**
-	 * Get the directory where scenes are stored.
+	 * Get the directory where scenarios are stored.
 	 */
 	UFUNCTION(BlueprintCallable, Category = "PS_Editor")
 	static FString GetScenesDirectory();
 
 	/**
-	 * Get the full file path for a scene name.
+	 * Get the full file path for a scenario name.
 	 */
 	UFUNCTION(BlueprintCallable, Category = "PS_Editor")
 	static FString GetSceneFilePath(const FString& SceneName);
 
-	/** Get the full file path for a scene name and its base level. Uses level-specific subdirectory. */
+	/** Get the full file path for a scenario name and its base level. Uses level-specific subdirectory. */
 	UFUNCTION(BlueprintCallable, Category = "PS_Editor")
 	static FString GetSceneFilePathForLevel(const FString& SceneName, const FString& LevelName);
 
 	/**
-	 * Get all saved scene names. Optionally filter by level name.
-	 * @param LevelFilter  If not empty, only return scenes associated with this level.
+	 * Get all saved scenario names. Optionally filter by level name.
+	 * @param LevelFilter  If not empty, only return scenarios associated with this level.
 	 */
 	UFUNCTION(BlueprintCallable, Category = "PS_Editor")
 	static TArray<FString> GetSavedSceneNames(const FString& LevelFilter = TEXT(""));
 
 	/**
-	 * Get the level name associated with a saved scene (reads the JSON header without spawning).
+	 * Get the level name associated with a saved scenario (reads the JSON header without spawning).
 	 */
 	UFUNCTION(BlueprintCallable, Category = "PS_Editor")
 	static FString GetSceneLevelName(const FString& SceneName);
 
 	/**
-	 * Returns true while a scene is being loaded (actors are being spawned from JSON).
+	 * Returns true while a scenario is being loaded (actors are being spawned from JSON).
 	 * Use in BeginPlay to skip default initialization — wait for OnPropertiesLoaded instead.
 	 */
 	UFUNCTION(BlueprintCallable, BlueprintPure, Category = "PS_Editor")
@@ -103,7 +125,7 @@ public:
 	static bool IsInEditorMode() { return bIsEditorModeActive; }
 
 	/**
-	 * Get all saved scenes for the current level.
+	 * Get all saved scenarios for the current level.
 	 */
 	UFUNCTION(BlueprintCallable, Category = "PS_Editor", meta = (WorldContext = "WorldContextObject"))
 	static TArray<FString> GetSavedSceneNamesForCurrentLevel(const UObject* WorldContextObject);
@@ -114,4 +136,8 @@ private:
 
 	/** Apply custom editable properties to a spawned actor. */
 	static void ApplyCustomProperties(AActor* Actor, const TMap<FString, FString>& CustomProperties);
+
+	/** Actors spawned via LoadScenario(), tracked so UnloadScenario() can find them.
+	 *  TWeakObjectPtr handles GC / manual destruction gracefully (skipped at unload time). */
+	static TArray<TWeakObjectPtr<AActor>> TrackedSpawnedActors;
 };

Unreal/Plugins/PS_Editor/Source/PS_Editor/Serialization/PS_Editor_SceneSerializer.cpp

@@ -202,7 +202,7 @@ bool UPS_Editor_SceneSerializer::SaveScene(const FString& SceneName, UPS_Editor_
 	return true;
 }
 
-bool UPS_Editor_SceneSerializer::LoadScene(const FString& SceneName, UPS_Editor_SpawnManager* SpawnManager)
+bool UPS_Editor_SceneSerializer::LoadScenario(const FString& SceneName, UPS_Editor_SpawnManager* SpawnManager)
 {
 	if (!SpawnManager || SceneName.IsEmpty())
 	{
@@ -523,9 +523,9 @@ void UPS_Editor_SceneSerializer::ClearScene(UPS_Editor_SpawnManager* SpawnManage
 
 	// NOTE: Mandatory-actor auto-spawn is intentionally NOT done here. ClearScene is called
 	// from three contexts: (1) "New Scenario" button (we want mandatory spawn — handled in the
-	// widget after ClearScene returns), (2) LoadScene before re-spawning saved actors (we
+	// widget after ClearScene returns), (2) LoadScenario before re-spawning saved actors (we
 	// don't want it — the JSON itself contains the mandatory actor, and there's a final
-	// EnsureMandatoryActorsPresent at the end of LoadScene that handles legacy saves), and
+	// EnsureMandatoryActorsPresent at the end of LoadScenario that handles legacy saves), and
 	// (3) BaseLevel switch (we don't want it — the new baseLevel isn't loaded yet, the
 	// MandatoryAnchor isn't in the world; the post-OnLevelShown hook handles that).
 }

Unreal/Plugins/PS_Editor/Source/PS_Editor/Serialization/PS_Editor_SceneSerializer.h

@@ -21,8 +21,8 @@ public:
 	/** Save the current spawned actors to a JSON file. */
 	bool SaveScene(const FString& SceneName, UPS_Editor_SpawnManager* SpawnManager);
 
-	/** Load a scene from a JSON file. Destroys current spawned actors and re-spawns from file. */
-	bool LoadScene(const FString& SceneName, UPS_Editor_SpawnManager* SpawnManager);
+	/** Load a scenario from a .pss file. Destroys current spawned actors and re-spawns from file. */
+	bool LoadScenario(const FString& SceneName, UPS_Editor_SpawnManager* SpawnManager);
 
 	/** Get a list of all saved scene names (without .json extension). */
 	TArray<FString> GetSavedSceneNames() const;

Unreal/Plugins/PS_Editor/Source/PS_Editor/UI/Widgets/PS_Editor_MainWidget.cpp

@@ -1352,7 +1352,7 @@ TSharedRef<SWidget> UPS_Editor_MainWidget::BuildSceneButtons()
 									}
 								}
 
-								SceneSerializer->LoadScene(FileName, SpawnManager.Get());
+								SceneSerializer->LoadScenario(FileName, SpawnManager.Get());
 								bSceneDirty = false;
 								if (SaveNameField.IsValid())
 								{
@@ -1653,7 +1653,7 @@ void UPS_Editor_MainWidget::PopulateSceneList()
 						// current sublevel as-is — don't unload it (avoids empty scenes).
 					}
 
-					SceneSerializer->LoadScene(Name, SpawnManager.Get());
+					SceneSerializer->LoadScenario(Name, SpawnManager.Get());
 					bSceneDirty = false;
 					if (SaveNameField.IsValid())
 					{

Unreal/Plugins/PS_Editor/Source/PS_Editor/UI/Widgets/PS_Editor_MainWidget_Legacy.cpp

@@ -1192,7 +1192,7 @@ TSharedRef<SWidget> UPS_Editor_MainWidget_Legacy::BuildSceneButtons()
 									}
 								}
 
-								SceneSerializer->LoadScene(FileName, SpawnManager.Get());
+								SceneSerializer->LoadScenario(FileName, SpawnManager.Get());
 								bSceneDirty = false;
 								if (SaveNameField.IsValid())
 								{
@@ -1487,7 +1487,7 @@ void UPS_Editor_MainWidget_Legacy::PopulateSceneList()
 						// current sublevel as-is — don't unload it (avoids empty scenes).
 					}
 
-					SceneSerializer->LoadScene(Name, SpawnManager.Get());
+					SceneSerializer->LoadScenario(Name, SpawnManager.Get());
 					bSceneDirty = false;
 					if (SaveNameField.IsValid())
 					{

Unreal/Plugins/PS_Editor/Source/PS_Editor/UI/Widgets/PS_Editor_MainWidget_UMG.cpp

@@ -130,7 +130,7 @@ bool UPS_Editor_MainWidget_UMG::LoadScenario(const FString& Name)
 	}
 	if (!SM) SM = SpawnManager.Get();
 	if (!Ser || !SM || Name.IsEmpty()) return false;
-	Ser->LoadScene(Name, SM);
+	Ser->LoadScenario(Name, SM);
 	OnSceneDirty.Broadcast();
 	return true;
 }