I go over how to setup your Blueprint Nativization Settings for success packing. Below are the settings for the DefaultEditor.ini
[BlueprintNativizationSettings]
;Steam Party Plugin UMG
+ExcludedFolderPaths=/SteamParty/UMG/
+ExcludedFolderPaths=/SteamParty/Blueprints/
;Steam Party Game Clases
+ExcludedAssets=/Game/ThirdPerson/Blueprints/BP_SaveGame
+ExcludedAssets=/Game/ThirdPerson/Blueprints/BP_TPCharacter
+ExcludedAssets=/Game/ThirdPerson/Blueprints/BPS_Example
+ExcludedAssets=/Game/ThirdPerson/Blueprints/GI_Example
+ExcludedAssets=/Game/ThirdPerson/Blueprints/GM_Example
+ExcludedAssets=/Game/ThirdPerson/Blueprints/PC_Example
+ExcludedAssets=/Game/ThirdPerson/Blueprints/W_GameMenu
+ExcludedAssets=/Game/ThirdPerson/Blueprints/W_MainMenu