I have posted this answer in a different topic as well but I am hoping this might help you a little as well. "Did you try using "Device Care" app? It might give you better overview of what takes the most space on your phone than "Files". I have included screenshot from my Device Care app. There you can see how much space is taken by Games, Secure Folder or Files. I hope this will make it easier for you to navigate to the trash files that take to much space."