I created a scene using HDRI in which an airdrop is there on ground but airdrop shadow is not visible which makes it looks unreal. I've used a shadow catcher and it is even having particle system to imitate grass like structure but shadow is not visible. What should I do? P.S. Model requires some work.

Here's render preview:

I created a scene using HDRI in which an airdrop is there on ground but airdrop shadow is not visible which makes it looks unreal. I've used a shadow catcher and it is even having particle system to imitate grass like structure but shadow is not visible. What should I do? P.S. Model requires some work.

Here's render preview:

Blender File: https://drive.google.com/file/d/1WpLjv3KZj5n3izid2DTM14uaYUzKG8bO/view?usp=sharing