Hi,
- Change the import rotation the static mesh editor as descibed above.
- In the static mesh editor (!) in the top left corner press Reimport Base Mesh.
If you try to Reimport from the context menu, right-clicking at the asset, it will ask you for a file. You don’t want this if you have the asset from the marketplace. Therefore, press that button in the static mesh editor.
I had a similar issue with a gun from the marketplace oriented in the wrong direction when attached to right hand socket.
Cheers