How to save a TextureRenderTargetCube to a file

Development Rendering
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1

Hi，I want to save a TextureRenderTargetCube in disk as a png file 。But i can not get FTextureRenderTargetCubeResource，there has not a function to get it。when i use GameThread_GetRenderTargetResource() i can get a FTextureRenderTargetResource 。
but this can only save one face of a cubemap，even i use this sentence to set the cubeface ，
FReadSurfaceDataFlags ReadPixelFlags(RCM_UNorm, ECubeFace::CubeFace_NegY);
it still can not change the face

2

my question is same to you, expect the next answer.

3

my question is same to you, expect the next answer.