So basically what I have learned from this "tutorial" is that the scene shoud be prepared (no idea if it should be game-ready or rendering-ready), and everything should work fine. If it doesn't you need to fix it.
Hi if you want to know more about blender check the course here: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-Rh73_hmYcdU.html Also for Unreal Engine 5 this is the link for the course: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-St2OD-loDZg.html
Many reason, but scaling and creating materials is pretty easy if you know how to do it. Watch the Blender course in the channel and you will see. Thank you