Trying to import a level from blender to unreal engine but keep having problems with uvs

Hello so basically I a noob to unreal engine and was tinkering with it.So decided to steal some assets from a game then put it into blender then into unreal.But I keep getting the:
leveltest21 has some nearly zero tangents which can create some issues
leveltest21 has some nearly zero bi normals which can create some issues
and no somoothing group information was found in this fbx scene please maker sure to enable the etc etc…

Here is the static mesh i am tryng to use as a level and here are the uvs:

Again i am really new to all this so i just did the basic uv unwrap and this is how it turned out.I know theres a lot of pieces but that cuz the object itself has pieces what am I suppose to fix?