UE4 False Scale & "nearly zero tangents"

Hello,
I’m new to exporting models to unreal and I’m having some Problems with this door I created in blender when i try to import it into ue4:
https://skfb.ly/6KPzZ (sketchfab)
https://drive.google.com/drive/folders/1SGRd_73tcGxHsS2ZCJIzwrpC4gz5UjkT?usp=sharing (google drive)

Can anyone help me?