UE4 V4.19.2
Settings - > Preview Rendering Level → Mobile/HTML5 → Default Mobile/HTML5 Preview.
Let it recompile, it will take few minutes.
see if they are still black.
UE4 V4.19.2
Settings - > Preview Rendering Level → Mobile/HTML5 → Default Mobile/HTML5 Preview.
Let it recompile, it will take few minutes.
see if they are still black.