Sprites shown in black colour when mobile preview?

Development Asset Creation
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1

I made a sprites with different colors
Its shown with their colors when i choose any game preview
But in mobile preview all sprites appears in black colour
???

2

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.