Further reading

Git LFS:

https://help.github.com/articles/installing-git-large-file-storage/

Unreal Dialog system:

https://docs.unrealengine.com/en-us/Engine/Audio/Dialogue

Ambient sounds:

https://docs.unrealengine.com/en-us/Engine/Audio/SoundActors

DataTables driven and maintained via .csv:

https://docs.unrealengine.com/en-us/Gameplay/DataDriven