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Dear P McKenzie,
Good day! Thank you for posting to Microsoft Community. I am happy to help you
I noticed that you have checked the web and the previous version, but you can't find the data. I would like to confirm if you used the same device when you last edited this file, it is possible that the file was not uploaded to the cloud, so there is no data in the cloud. If that's the case, you can check it now in the device you last edited.
If you confirm that the data has been uploaded to the web client, you can also contact the admin user (the school's IT department) and ask them to contact Microsoft support, who can help you check if the data exists from the backend, and only they have permission to do so: Raise a service request in Microsoft 365 admin center
Thanks for your cooperation.
Sincerely,
Tin | Microsoft Community Moderator