UAsset files will not load

I just got the Sonic Infinity Engine, which was made in a previous Unreal Engine version, and I try to launch it in ue4. The project loads with all of the folders that were in the content folder, but the uassets won’t load. I’ve watched lots of videos on drag and drop, and copy and paste to the content folder, but it just won’t work. When I drag and drop, it doesn’t recognize the “uasset” type, and when I copy and paste the uassets to the content folder, it acts like it isn’t even there. I feel that either the uassets aren’t being migrated to ue4 or the uassets are not accompanied by another file.