Microsoft small business knowledge base

Article ID: 2813150 - Last Review: September 24, 2014 - Revision: 20.0


When you use Microsoft OneDrive for Business (formerly Microsoft SkyDrive Pro) to sync files from Windows Explorer to a Microsoft SharePoint site, some files may not sync as expected. Instead, a red X is displayed on the file icon in Windows Explorer and then you experience one of the following problems:
  • In the Microsoft Office Upload Center, you receive the following error message:
    Upload Failed
    Invalid characters

    Collapse this imageExpand this image
    Sceen shot of upload failed status

  • OneDrive for Business - Sync problems appears in the notification area. When you click View sync problems, you receive the following message:

    X item can’t be synced with OneDrive for Business

    Note X is the number of files that OneDrive for Business is trying to sync.

    Under the Error column, the following message is also present:

    This file name contains invalid characters.
Note This issue occurs if you're syncing files to Microsoft Office 365 SharePoint Online or Microsoft SharePoint Server 2013.


To resolve this issue, delete any invalid characters from the file name of the Windows Explorer file that you're trying to upload to the SharePoint site.

For more information about the characters that can cause this specific issue, see the “Invalid characters” section in the following Microsoft Knowledge Base article:
2933738  ( ) Restrictions and limitations when you sync SharePoint libraries to your computer through OneDrive for Business
After you have deleted unsupported characters from the file name, the file will sync with OneDrive for Business.


This issue occurs because the characters that are listed in the "Solution" section are not supported by OneDrive for Business.

For more information about OneDrive for Business, go to the following Microsoft website:
What is OneDrive for Business? (

Still need help? Go to the Office 365 Community ( website.

Applies to
  • Microsoft SharePoint Online
  • Microsoft SharePoint Server 2013
  • OneDrive for Business
o365e o365p o365a o365m o365022013 kbgraphxlink o365 kbgraphic KB2813150
Additional support options
Ask The Microsoft Small Business Support Community
Contact Microsoft Small Business Support
Find Microsoft Small Business Support Certified Partner
Find a Microsoft Store For In-Person Small Business Support