why?
the tree trunk is transparent apparently… why?
btw i imported this model from blender.
Hello !
The most common issue in that times is that the normals are inverted.
Come back to Blender, or any 3D software, and check that all the normals are being correctly calculated.
In Blender enter in Edit Mode and [Shift] + [N] recalculate the normals.
You can look the normal faces in “Viewport Display” and check “Face Orientation”
Blue faces are the one with correct UVs, red ones are inverted.
Export that again as an .fbx and see how look in Unreal.
I hope it helps you!
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