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Dear Kirsty_JHS,
Good day!! Thanks for posting your concern on this Microsoft Community~
As per the description shared, I understand your concern and I would like to recommend you check whether the missing content is present either in First or Second stage of the Recycle bin of your OneDrive for Business.
If you have already checked but there is no missing data, then I would like to recommend you to immediately connect with the related development team, where they can try to restore the missing data using PITR method.
So, I request you contact the IT admin of your organization: How do I find my Microsoft 365 admin? - Microsoft Supportr and request them to raise a new service request from the Microsoft 365 admin center, where the related team will get in touch with you on your preferred contact method for further investigation: Get support - Microsoft 365 admin | Microsoft Learn
Note: Please accept our sincere apologies for redirecting you to related development support team because the moderators in this community are limited with the resource for further investigation and to get a quick resolution to your problem, we requested it.
I appreciate your patience and understanding. Have a wonderful day!!
Best Regards,
Sophia