How to create astc texture on ios?

Development Rendering
, , ,
1

UTexture2D* DestTexture = UTexture2D::CreateTransient(SrcSize, SrcSize, SrcTexture->GetPixelFormat());
I want use SrcTexture to create same format texture, but this code return nullptr on ios. i know ios used ASTC format texture.so how to create astc texture on ios?