Bridge & your devices · Collab Sync
What happens in Collab Sync when both Macs change the same file?
Short answer: The newer version wins and the other is kept beside it with “conflict” in its name, so nothing is lost. Review the “Files changed on both Macs” note and click Restore to keep the other version instead.
The newer version is kept, and the other is saved right beside it with “conflict” in its name — nothing is lost. You'll get a notification and a Files changed on both Macs note.
Open Collab Sync and Review the note to see each file; if you'd rather keep the other version, click Restore and it syncs back across.
Times are compared carefully, so a Mac with a wrong clock can't quietly win; if a clock looks wrong, Storage Studio tells you to check it.