Slitherine

I downloaded Unreal Engine because I'd like to make my own flag mod, new skins, and camouflage and so forth. But one problem I'm having is that after moving the .uasset/uexp files from the game content folder to the UE project content folder, those files are not appearing in the engine. I'm using UE version 4.26.2, which I understand is the last version the game updated to. Any advice?

I had the exact same issue when trying to import the flag models for my custom Iran scenario. Would be curious if anyone knows the issue.