Fail to pack Android Resource File

I’m packing a project using UE_4.27.2. I successfully generated the apk file. My question is that how to put my custom data file ( a zip file ) to the apk. I have tried some solution (additional non-assets to pack), but can’t get even an empty directory. Is there any way to do it?
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And I wonder what is the proper code to unpack these files from the pack file.
FPaths::ProjectContentDir() / "GalateaResource" always point to an unexist directory.