r/S24FE

2 or 3 days ago i noticed that the storage in my phone went from 205 gb to 192 gb by itself. I don't remember deleting or removing anything. What might be the cause behind this. How to find out what has been deleted by itself. No significant action has been taken from my side like os updating or anything like that. There's nothing in recycle bin also. Anything like this has happened for first time