1. Check the file is not open in another program that you aren’t currently using.
2. Clear the Temporary Internet Files found in your browser.
3. Try to delete the file in a different browser or the OneDrive app.
4. Try to delete the file in a different computer or device.
5. Check the Recycle Bin for the file.
6. Try to delete the file from a different location in OneDrive.
7. Check permissions and whether the file is shared or not.
8. Try to rename or remove characters from the file name.
9. Contact the IT support if the files can not be deleted.