Hi Michelle,
A few options to integrate your native mobile framework are:
1 . drop the code directly in the game project
2 . build the external code as static libraries and link it to the game project (https://dev.epicgames.com/documentation/en\-us/unreal\-engine/integrating\-third\-party\-libraries\-into\-unreal\-engine)
3 . for Android Java, .java files or .jar’s can be added to the project and code can be invoked via JNI from native game side code or a linked static library.
Best regards..