Cannot get assets to cast shadows

[JemJem (Jem)]

I am using the rock and cliff assets from the Rural Australia package. I believe the assets are one sided meshes. I’ve enable “cast shadow”, “Shadow Two sided” and have also made the material property two sided, however i still can’t get the asset to cast a shadow on the ground. Other assets from different packages are casting shadows so I don’t think it is a problem with the world lighting settings.

The green rock is from a different package and has shadows. Grey rocks are the Rural Australia assets without shadows.

[Astaraa]

Does it have Dynamic Shadow and Static Shadow?
Two sided shouldn’t be necessary.

[JemJem (Jem)]

Thank you for your reply. It does have Dynamic Shadow and Static Shadow.
I just found the problem. I needed to set the ShadowLength in the material to around minus 0.2 to -0.5 and the shadows appeared.