Hello, sorry for taking too long.
Here you can see that the normals are not flipped in Blender. I don’t know if I´m understanding correctly but the normals seem correct in Unreal as well, as I should’t be able to see the faces if these aren’t pointing in the correct direction. Also, the green faces in the screenshot you showed me are showing just fine. I used Recompute Normals and Recompute Tangents, as well as Remove Degenerates.
I’m attaching the model source and fbx again in case I somehow attached incorrect ones last time. [Download files here.][4]
Thanks for your help and for being patient with me.