Vanishing mesh when we open it

Hello, the buyer sent me the following message:"Hi - we just purchased the Lady_Ghost asset on UE marketplace. The Lady_Ghost_Skin_2 (white hood) keeps vanishing when we open it in unreal engine. Could you please provide the solution to this issue? "

1 screen I have, 2- from the buyer .I ask for help, thanks

Funny how your “buyer” hides the material slots.