I'm afraid that's a bug in macOS, not Default Folder X. Because of that, there's unfortunately nothing I can do to fix it. It appears that the data caching system used by file dialogs doesn't refresh the cached contents of the file listing immediately, so newly created files sometimes don't show up (sometimes for minutes). I've tried various strategies for flushing the cache, but haven't been able to find one that works around the problem. I've also submitted the bug to Apple, of course, but it seems to be a low priority for them.Jon