Hi Eric, I don't know syncthing at all and how MacOS works even less [1] but I do know emacs... a little. Could the problem be related to how emacs does backups? cf. backup-by-copying and make-backup-files
Just throwing things into the mix in case something helps! Footnotes: [1] the last Apple computer I used was the Lisa... ;-) -- : Eric S Fraga (0xFFFCF67D), Emacs 25.0.92.1, Org release_8.3.4-668-g809a83
