Dear Arnav Verma,
Good day!!
Apologies for the inconvenience caused and please don’t worry, let’s work together on your concern and move towards a resolution path.
I understand your concern and I would like to convey that I have tested behavior at my end by uploading multiple files to the OneDrive for Business, where there is no issue in uploading the data and I have checked with the different user accounts, where there is no issue.
In this situation, I would like to request you check whether the same problem happens in the InPrivate or Incognito window of the browser.
If the same problem persists, I am sorry to convey that the problems should be further investigated by the related development team, where they can collect the related logs while reproducing the problem and perform further investigation.
Note: I have checked the service health dashboard at the Microsoft end, where there is no related incident reported.
So, I request you to connect with your IT admin of your organization (How do I find my Microsoft 365 admin? - Microsoft Support) and raise a new service request from the Microsoft 365 admin center so that the related development team will connect with you and investigate the issue further.
Reference: Get support - Microsoft 365 admin | Microsoft Learn
Note: We apologize 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.
Appreciate your patience and understanding. Have a great day!!
Best Regards,
Sophia