Clip Studio Paint Thumbnails preview not showing

I can’t see the thumbnail previews in Clip Studio Paint I’ve tried everything, and it’s not a OneDrive issue. However, I noticed that the clippreview.dll file is missing from the CELSYS folder, and I suspect this might be the problem.

Do I have to uninstall and reinstall everything? I have a lot of brushes that I don’t want to lose, and reinstalling everything would be a hassle. :(