Resilio Sync software is very useful, but it is buggy in a worrisome way -- at least on my Mac running Catalina. When I click on an rsls placeholder file to download the file from another computer, the placeholder soon disappears and I am left uncertain when the file will complete downloading. The Sync icon in my menu bar shows no download progress either, just a slowly rotating animation indicating that the download (or another upload or download? I can't tell) is happening. So, yes, the software does seem to have bugs and I am concerned by the pace of updating at Resilio. Not concerned enough to switch to something else (which I hope I won't have to do), but concerned nevertheless.