I have created the default scene and added a ground plane and I do not get shadows on the ground.
for reference, I’m providing a zip of the example scene that is described in this video that DOES NOT have shadows on the ground. (either raytraced or non-raytraced default settings) https://drive.google.com/file/d/1DZ0C0Tbce4BE4Lt598RzRWwja2q18Zc-/view?usp=sharing
ue4.26 + truesky4.3.5aac6daae
turning on the “atmosphere sun light” and “cast cloud shadow” on the created directional light seems to have no affect.
is it possible for you to provide a reference project like the one shown in this video: https://www.youtube.com/watch?v=DTPl-kB4Mw8