Hello there @user_e4af5306dc3668d4fabcf41c383ef7b774d656501864a7c1c2dd94!
Unfortunately, Blender and Unreal do have a tendency to clash with each other, it’s a recurrent conflict around the community.
As a first step, test reset export/import settings in both programs. After that, please follow the method from the video tutorial below, it has worked in the past for my own projects:
