When you go offline, Fusion 360 enters a grace period. You can work without an internet connection for up to . Once you reconnect to the internet, the software syncs your work back to the Autodesk cloud.
You can extend how long files stay on your machine by going to Preferences > General and adjusting the "Offline cache time period (days)". What You Can (and Can't) Do Offline fusion 360 offline
Imagine this scenario:
You cannot simply unplug your ethernet cable and expect Fusion to work. You must enable Offline Mode while you still have internet access . When you go offline, Fusion 360 enters a grace period
You have satellite internet that cuts out for hours at a time. You can extend how long files stay on
It is perfectly capable for a weekend warrior working on a personal project in a cabin without Wi-Fi, or for a business trip lasting a few days. However, relying on it as your primary workflow is risky due to the 14-day limit and the threat of file conflicts.
If you are stuck in offline mode unintentionally, Autodesk Support suggests checking your firewall settings or restarting the application.