So I tried to import fbx mesh_B from Blender after I imported a minute earlier mesh_A and for some reason new FBX importer overwrites mesh_A with mesh_B. What am I missing? They have different file names. Worked fine in 5.4.
Edit:
To be more specific, I am saving FBX into project folder and it keeps trying to overwrite same first imported mesh. Restarting Unreal allows one new Import after that all subsequent imports are named like first FBX.
Exporting to separate folder will make export work but mesh is named like first one. Something is broken.
Also UDS does not name new mesh like the file, so that sucks too. No idea what to use to have something as basic as working import for SM.