UE4Game folder on External Storage -

Development Platform & Builds Mobile
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18

wingedrobin give right answer. If you want use internal storage for UE4Game set true “Use ExternalFilesDir for UE4Game files” and in shipment will be using internal storage. In another build will be using external storage.

You can see is UE4 sources.
https://github.com/EpicGames/UnrealEngine/blob/c3caf7b6bf12ae4c8e09b606f10a09776b4d1f38/Engine/Source/Runtime/Launch/Private//AndroidJNI.cpp
in JNI_OnLoad setting GFilePathBase

GFilePathBase = FJavaHelper::FStringFromLocalRef(Env, (jstring)Env->CallObjectMethod(*externalStoragePath, getFilePath, nullptr));

And GFilePathBase use for set on platform FilePathBase and BasePath when bUseExternalFilesDir is true
in Java_com_epicgames_ue4_GameActivity_nativeSetGlobalActivity

if (bUseExternalFilesDir)
		{
#if UE_BUILD_SHIPPING
			GFilePathBase = GInternalFilePath;
			GOverrideAndroidLogDir = bPublicLogFiles;
#else
			GFilePathBase = GExternalFilePath;
#endif
			FPlatformMisc::LowLevelOutputDebugStringf(TEXT("GFilePathBase Path override to'%s'\n"), *GFilePathBase);
		}
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