Hi @Anonymous,
Hmmm, you should be able to still hit save and have it save to the offline cache (which is on the computer). Is the export option in the File menu available as well? If not, does toggling the offline switch within Fusion manually seem to change this behavior?
As far as local file storage, we do keep crash recoveries, and local offline cache storage local to the machine (as well as any manual exports of files you do). Granted, if this is in a school and on their computers, you may need to ask a teacher/IT admin to find the files as they are embedded in the local user profile which typically is denied access to students in a school environment.
Let me know if you want more information as to where these are stored.
Thanks,
James Youmatz
Product Insights Specialist for Fusion 360, Simulation, Generative Design