Unreal Engine 4 isn't exactly known for supporting mods ..
That's simply not true. Conan Exiles is based on UE4 and it supports modding. It has a full development kit that can be downloaded through the Epic launcher.
I tried it and as far as I remember it supports various games. Basically mods are deployed as .PAK files that you need to put in a certain directory (e.g. /Mods/).
There is also a file that determines load order. The dev kit seems to be fairly complicated and has a huge footprint (about 188 GB for Conan Exiles).
Outer Worlds questions
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