Autosave not working

I'm using office 365 and my excel crashed and usually when I reopen it will show me the autosave documents. This time it showed the documents I had previously saved on onedrive, but not the new documents I hadn't saved.
I've checked my settings and all looks fine. I checked the location where autosave documents should be and they werren't there.
I've since retested and nothing seems to be autosaving. I've tried turning off autosave and turning back on again, but still doesn't create a temporary file.
How do I fix this? Thanks

Found a comprehensive article. Might help?

https://www.easeus.com/todo-backup-r...%22Options%22.
Pete