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Embed UE4 project into another app

I’ve been trying to work on a proof of concept (POC) where I can embed a UE4 project into an existing application (in my case NativeScript) but this could just as easily apply to Kotlin or ReactNative.

In the proof of concept I’ve been able to run the projects on my iPhone launching from UE4 pretty easily by following the Blueprint and C++ tutorials for the FPS. However the next stage of my POC requires that I embed the FPS into an existing NativeScript application, this application will manage the root menu, chat, and store aspects of the platform in the POC.

The struggle I’m running into is that I cannot find how to interact with the xcode project generated from the blueprint tutorial and the C++ tutorial generates a xcode project that i’m unsure where the actual root is that I need to wrap.

Has anyone seen a project doing this before and if so are there any blogs or guidance that you can point me to? I’ve been Googling and looking around for a couple weeks and have hit a dead end. I found a feedback post here from April of 2020, that was referring to a post in January 2020 that talked about how Unity has a way to embed into other applications. But other than that it’s a dead end.