A Microsoft file hosting and synchronization service.
Dear CEYHUN MAHMUDOV,
Good day! Thank you for posting to Microsoft Community. I am happy to help you.
First I suggest you change your password, this prevents others from logging into your account to access the files in OneDrive. Change your work or school account password - Microsoft Support
Once the changes are complete, check the access permissions for the OneDrive file, it is possible that the file has been shared before:
- Going to the OneDrive website.
- Navigating to the "Shared" section to see who has access to your files.
- Removing access for any users who should no longer have it.
And if possible, I want to see all the previous activities that that employee did on my account.
If this user uses your account to log in to OneDrive, it is difficult to find all the changes he has made, this is because Microsoft can only detect the behavior of the account, can not tell who is using the account, so I recommend you change your account password as soon as possible to avoid losing important data!
Thanks for your cooperation. Have a nice day and stay safe 😊
Sincerely,
Tin | Microsoft Community Moderator