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Good day @Pabba, Gayathri,
In SharePoint Online and OneDrive, this type of error usually means the file or its parent site was renamed, moved to a different location, or deleted. Microsoft has a step‑by‑step guide that walks through the standard checks and recovery options, including using the Recycle Bin and verifying whether the site or library still exists. You may find this guidance helpful: Error 404 File/Page not found in OneDrive or SharePoint - SharePoint | Microsoft Learn
Some of the recovery steps described there require SharePoint Administrator permissions. If you’re an end user without admin rights, I’d recommend contacting your Microsoft 365 administrator and asking them to check this on your behalf.
Regarding your question about who deleted the file and when, that information is typically available through audit logs in the Microsoft Purview portal, under Audit. An admin can search within a specific date and time range and filter activities to “Deleted file” to see whether the file was removed, by whom. This process is outlined here for reference: How to Audit File Deletions in SharePoint Online? - SharePoint Diary
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It’s also worth keeping in mind that access to Microsoft Purview auditing depends on your organization’s subscription or add‑on licensing, so not all tenants may have this feature enabled.
As this is a user‑to‑user support forum, I don’t have visibility into your tenant or the ability to trace or restore files directly. Still, I hope the guidance above helps you and your admin identify what happened and take the next appropriate steps.
I hope this information and the documentation help clarify things for you. If you have any updates or follow‑up questions, please feel free to leave a comment under this post. This will make it easier for me to receive notifications and follow up with you to continue providing support.
Thank you for your understanding.
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