My juypter notebook work disappeared on Anaconda Cloud

I was working on my notebook, I went to save it, it said save failed, said 401 error, then it said my folder didn’t exist even though I saved it multiple times beforehand, so i reloaded and all work was gone.

https://nb.anaconda.com/jupyterhub/user/6112fde8-7158-40ac-a1bb-a2cf3f420ea9/lab/workspaces/auto-K/tree/Coursework%201/COM1011-750024184.ipynb?

Now, if you open it, it will automatically load to a blank one. It is quite important as I have been developing it for the past few days and I really don’t know how it vanished into thin air.
If possible, please help me with it.