Thanks for the file. Unfortunately, the file is filled with zeros only even it is not empty. We are not able to tell what exactly has happened, but for sure we would like to investigate this more
and prevent this from happening again.
Could you add to the GitHub issue the following comments:
* drawio version you used (can be seen under Help in the editor)
* browser version and operating system
* is anything unexpected happen as the user above reported? power down, system crash, anything you noticed it was unusual etc.
We are truly sorry this happened.
Kind regards,