On a new Windows 11 laptop, many files are showing as 0 bytes on disk, in both Dropbox and Windows Explorer properties. These are files of all sizes, not just tiny ones. I have only basic account, so all files should be local. The problem is that I use tools like WinDirStat to see what I'm using, but these are now not showing most files. On my old laptop (also W11) all files show, eg they have file size on disk. What's going on?