How to prevent Packaging of unneeded Engine Files in 5.3

When Packaging my android project I have noticed that Unreal Engine cooks about 2000 Texture files found under “Engine/Content/EngineMaterials/Substrate/”. These seem to be Packaged as well, at least I don’t see them getting excluded. I don’t use Substrate in my project, and deleting them does not affect the project (although I don’t want to remove them as they are Engine files). How can I tell the engine not to cook/pack these and other useless files? Is there a log where I can see exactly which cooked files got packaged in the final .apk?

So far, I have tried creating a DefaultPakFileRules.ini file as suggested by this post, but it does not seem to do anything. Its contents are:

[ExcludeDefault]
Targets="Shipping,Development,Debug"
bExcludeFromPaks=true
bOverrideChunkManifest=true
+Files=".../Engine/Content/VREditor/*"
+Files=".../Engine/Content/EditorMeshes/Camera/SM_CraneRig_Arm.*"
+Files=".../Engine/Content/EngineFonts/DroidSansMono.*"
+Files=".../Engine/Content/Sequencer/DefaultBurnIn.*"
+Files=".../Engine/Content/Sequencer/DefaultBurnInOptions.*"
+Files=".../Engine/Content/EngineMaterials/Substrate/*"

bump

Tested on UE5.5.
It seems it has problems with going deep into directory structure, so unfortunatelly you have to type all directories as well.
Tested with this configuration, works well:

[ExcludeDefault]
bExcludeFromPaks=true
bOverrideChunkManifest=true
+Files=".../Engine/Content/EngineSounds/*"
+Files=".../Engine/Content/Maps/*"
+Files=".../Engine/Content/MobileResources/*"
+Files=".../Engine/Content/MobileResources/HUD/*"
+Files=".../Engine/Content/Tutorial/*"
+Files=".../Engine/Content/Tutorial/SubEditors/*"
+Files=".../Engine/Content/Tutorial/SubEditors/TutorialAssets/*"
+Files=".../Engine/Content/VREditor/*"
+Files=".../Engine/Content/VREditor/LaserPointer/*"
+Files=".../Engine/Content/VREditor/Sounds/UI/*"
+Files=".../Engine/Content/VREditor/TransformGizmo/*"
+Files=".../Engine/Content/VREditor/SnapGrid/*"