Running a program outside of terminal

I'm trying to bring up a terminal to interactively ask for a file, and open it using a GUI program: foot /bin/sh -c 'file=fzf;(setsid xdg-open "$file" &)' I'm using setsid, because otherwise the terminal takes down the xdg-open with it when it exits. The command above, however, doesn't work: it still exits without showing anything on the screen. However, when I add a sleep at the end, it *does* work: foot /bin/sh -c 'file=fzf;(setsid xdg-open "$file" &); sleep 0.0000000001' The terminal exits, but the process started by xdg-open remains running. What is going on here? Is there a cleaner way such that I can avoid the sleep (because I assume the exact time to sleep depends on the system). I tried using disown, but this doesn't work at all (even with the sleep).