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Problem

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:

Note: This article applies only to the previous OneDrive for Businesssync app (groove.exe). In most cases, we recommend that you use the newer OneDrive sync app (onedrive.exe) instead. Which OneDrive app?
  1. In the Microsoft Office Upload Center, you receive the following error message:
    Upload Failed
    Invalid characters
  2. In 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.

Solution

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 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.

More information

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 What is OneDrive for Business?


Still need help? Go to Microsoft Community.

This article contains information about the restrictions and limitations that apply to file names and file types when syncing with OneDrive (), OneDrive for Business () or SharePoint Online.

Note: If you're looking for restrictions and limitations that apply to the earlier version of OneDrive for Business (groove.exe), read KB 2933738.

What's New

28 January 2019: Files On-Demand and Office integration now supported for Mac users on macOS 10.14.2 and above. You can enable Files On-Demand within the preference menu.

14 December 2018: Updated information in File upload size and Windows specific limitations.

7 December 2018: Added more information on Outlook .pst data files to blocked file types.

In This Article

Restrictions
Limitations
Troubleshooting tips

Restrictions

Invalid characters

Applies to:

Certain characters have special meanings when used in file names in OneDrive, SharePoint, Windows and macOS, such as '*' for wildcards, and ' in file name paths. If a file or folder you’re trying to upload to OneDrive contains any of the characters listed below, it may prevent files and folders from syncing. Rename the file or folder to remove these characters before you upload it.

Characters that aren't allowed in file and folder names in OneDrive, OneDrive for Business on Office 365, and SharePoint Online
Characters that aren't allowed in file and folder names in OneDrive for Business on SharePoint Server 2013
' * : < > ? / |
~ ' # % & * : < > ? / { | }.
Notes:

Invalid file or folder names

Applies to:

These names aren't allowed for files or folders: .lock, CON, PRN, AUX, NUL, COM0 - COM9, LPT0 - LPT9, _vti_, desktop.ini, any filename starting with ~$.

Notes:

Invalid or blocked file types

Applies to:

There are no blocked file types in OneDrive, but if you are a OneDrive for Business user, some file types may be blocked on your organization’s SharePoint site. The list of blocked files will vary depending on your administrator.

For security reasons, a number of file names and extensions can't be uploaded since they are executable, used by SharePoint Server, or used by Windows itself. For more info, see Types of files that cannot be added to a list or library.

Notes:

Network or mapped drives

Applies to:

You can't add a network or mapped drive as your OneDrive sync location. OneDrive doesn't support syncing using symbolic links or junction points.

Elevated privileges

Applies to:

OneDrive can’t be run with elevated privileges, and you will not be able to see OneDrive menu items within File Explorer. However, the per-machine sync app installation is helpful especially for multi-user computers and when you don’t want exe files running from the user profile. See also Unable to share OneDrive files.

Shared with Me

Applies to:

You can't synchronize the Shared with Me view grouping of files from a OneDrive for Business site.

Guest accounts

Applies to:

Synchronizing content using an external or guest user is currently not supported by OneDrive.

Authenticated proxies

Applies to:

Authenticated proxies aren’t supported in OneDrive.

OneNote notebooks

Applies to:

OneNote notebooks have their own sync mechanism outside of OneDrive. If you plan on sharing a OneNote notebook—with yourself or others—it's best to create it on OneDrive right from the start. Moving an existing OneNote notebook into a folder synced by OneDrive without going through the OneNote application is not currently supported.

Once a OneNote notebook is saved in OneDrive, if you are syncing the folder that contains the notebook, you will find a stub .url file, which will open the notebook on the website.

Read how to Move a OneNote notebook to OneDrive.

Limitations

File upload size

OneDrive
OneDrive for Business
15GB
15GB
Note: For more help, read to how Fix problems uploading files on the OneDrive website.

Invalid Characters In Filename Windows

File name and path lengths

Applies to:

The entire path, including the file name, must contain fewer than 400 characters for OneDrive, OneDrive for Business and SharePoint Online. If you exceed that limit, you'll receive an error message.

Notes:

Thumbnails and previews

Applies to:

Thumbnails are not generated for images larger than 100 MB.

PDF previews are not generated for files larger than 100 MB.

Number of items that can be synced

Applies to:

Although SharePoint Online can store 30 million documents per library, for optimum performance we recommend syncing no more than 300,000 files across all document libraries. Performance issues can occur if you have 300,000 items or more across all libraries that you are syncing, even if you are not syncing all items within those libraries.

Notes:

Libraries with Information Rights Management enabled

Applies to:

Libraries can be synchronized as read/write with sync app for Windows build 17.3.7294.0108 or later, or OneDrive for Mac build 18.151.0729.0014 or higher.

Note: Admins: Learn how to configure the Azure Rights Management service.

Differential sync

Applies to:

Differential sync is only possible for Microsoft Office files in the new file format, .docx, .pptx, .xlsx.

This is part Office Integration and requires:

Libraries with specific columns or metadata

Windows 10 File Name Invalid Characters

Applies to:

If you have libraries with Checkout, Required or Validation columns or metadata, or when Draft Item Security is set to either Only users who can edit or Only users who can approve items in Version Settings of the library:

Instructions for removing sync-blocking column settings

Require Check Out
  1. Browse to the document library that you want to configure.
  2. In the toolbar, on the Library tab, in the Settings group, choose Library Settings.
  3. In General Settings, choose Versioning settings.
  4. In Require Check Out, select No (default).
Draft Item Security
  1. Browse to the document library that you want to configure.
  2. In the toolbar, on the Library tab, in the Settings group, choose Library Settings.
  3. In General Settings, choose Versioning settings.
  4. In Draft Item Security select Any user who can read items (default).
Content Approval
Windows 10 file name invalid characters
  1. Browse to the document library that you want to configure.
  2. In the toolbar, on the Library tab, in the Settings group, choose Library Settings.
  3. In General Settings, choose Versioning settings.
  4. In Content Approval select No (default) for Require content approval for submitted items.
Required Column
  1. Browse to the document library that you want to configure.
  2. In the toolbar, on the Library tab, in the Settings group, choose Library Settings.
  3. In the Columns section of the page ensure no columns are in the Required section.
Note: When the Management of content types is enabled, the information regarding require columns won't be presented, and in some cases by opening them the required setting, won’t be visible as well. Make sure the management of content types is disabled to make this process faster, and re-enable it when done if necessary.
Exclude from Offline Client - Library level
  1. Browse to the document library that you want to configure.
  2. In the toolbar, on the Library tab, in the Settings group, choose Library Settings.
  3. In General Settings, choose Advanced settings.
  4. In Offline Client Availability select Yes (default).
Exclude from Offline Client - Site collection level
  1. Browse to the site collection that you want to configure.
  2. In the toolbar, on the Site tab, in the Settings group, choose Site Settings.
  3. Under Search, choose Search and offline availability.
  4. In Offline Client Availability select Yes (default).
Limited-access user permission lockdown mode
  1. Browse to the Site Settings that you want to configure.
  2. In the settings choose Site collection features under the Site Collection Administration heading. ​
  3. Find Limited-access user permission lockdown mode and if its enabled, disable it and verify the behavior.
Permissions
  1. Browse to the document library that you want to configure.
  2. In the toolbar, on the Library tab, in the Settings group, choose Library Settings.
  3. Find Permissions for this document library and then Check Permissions for the user
  4. To ensure the user has high-enough permissions to have the file sync in more than read only mode, the level must be Contribute or higher.
Validation

Illegal Windows Filename Characters

  1. Browse to the document library that you want to configure.
  2. In the toolbar, on the Library tab, in the Settings group, choose Library Settings.
  3. Under General Settings, select Validation Settings
  4. Remove any column validation and select Save.
Learn more about how to manage Data and lists in SharePoint.

Windows specific restrictions and limitations

Applies to:

Invalid File Name Characters Windows

File Explorer displays the first 35 characters of a site library’s name and site name combination for a library that you have synchronized. This doesn’t affect the ability to sync these items within the limits that are described in this article.

Roaming, Mandatory, and Temporary Windows profiles aren't supported. The OneDrive sync app only supports users who can write to OneDrive application directories.

Additionally, the OneDrive sync app is only supported in Virtual Desktop Infrastructure (VDI) environments in the following cases:

Read more about using the sync app on virtual desktops.

For the sync app to work as designed, the following requirements must be met:

OneDrive Files On-Demand is only supported on Windows 10 Fall Creators Update and later versions.

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macOS specific restrictions and limitations

Applies to:

Case-sensitive formatted disk volume isn't supported.

Note: Please note that Invalid characters restrictions also apply to macOS.

Troubleshooting hints and tips

Follow these hints & tips to get the most out of OneDrive and to make sync as trouble-free as possible.

OneDrive system requirements

Applies to:

OneDrive requires an active Microsoft account, or a work or school account. Your PC must also meet certain operating systems and file system requirements. Read more about the OneDrive system requirements

Support and Recovery Assistant

Applies to:

The Support and Recovery Assistant app can help you identify and fix several issues with OneDrive for Business sync. Read how to use the Office 365 Support and Recovery Assistant.

If your account or environment is not supported by the Support and Recovery Assistant, read how to Fix OneDrive for Business sync problems. Download teenage mutant ninja turtles movie 2018.

Only sync what you need

Applies to:

OneDrive Files On-Demand helps you access all your files in OneDrive without having to download all of them and use storage space on your device. Learn more about OneDrive Files On-Demand.

You can also download fewer files by choosing which OneDrive folders to sync to your computer.

Invalid File Name Characters Windows 8

Note: You won't lose files or data by disabling or uninstalling OneDrive on your computer.

Check you're not syncing too many files

Applies to:

If OneDrive sync seems to be stuck for a long time or the status shows 'Processing 0KB of xMB' it could be because you have a lot of files in your OneDrive or a lot of new files to be uploaded. If you have more than 100,000 files, sync can take a long time.

Note: For transferring large files or lots of files, we recommend adding the files to the OneDrive desktop app rather than the using Upload button on the website.

To see how many files you have in your OneDrive:

  1. Open File Explorer.
  2. Right-click the OneDrive folder and select Properties.
  3. If the Contains number is more than 100,000 you should consider which OneDrive folders to sync to your computer.

Powerpoint 2003 download free. If the sync is already in process, you can Pause and Resume your sync to get things going again.

  1. Select the white or blue OneDrive cloud icon in the notification area, at the far right of the taskbar.
    Note: You might need to click the Show hidden icons arrow next to the notification area to see the OneDrive icon, or click and start typing 'select which icons' to display the notification area settings option, and then show Microsoft OneDrive. If the icon still doesn't appear in the notification area, OneDrive might not be running. Click , type OneDrive in the search box, and then click OneDrive (not 'OneDrive for Business' as that may be an older version) in the search results.
  2. Select More > Pause syncing.. , and select either 2, 8 or 24 hours.
  3. Select More again and select Resume syncing

Make sure you don't have duplicate filenames

Applies to:

Invalid File Name Characters Windows 6

You may have sync conflicts if you're uploading multiple files on the OneDrive website at the same time, or if you made changes in your OneDrive folder on another PC that is syncing at the same time.

Sync issues can also occur if you edit files offline.

To reduce sync conflicts, rename the edited files or folders to something new or unique, and then save it again.

Learn more

Applies to:

Applies to:

Characters To Avoid In File Names

Need more help?

Get online help
See more support pages for OneDrive and OneDrive for Business.
For the OneDrive mobile app, see Troubleshoot OneDrive mobile app problems.
Email support
If you still need help, shake your mobile device while you're in the OneDrive app or email the OneDrive support team. To contact OneDrive for Business support from your PC or Mac, select the OneDrive icon in the notification area or menu bar, then select More > Send feedback > I don't like something.
OneDrive for Business Admins can also view the OneDrive for Business Tech Community, Help for OneDrive for Business Admins, or contact Office 365 for business support.
Got feedback?
OneDrive UserVoice is your place to suggest the features you’d like to see us add to OneDrive. While we can’t guarantee any specific features or timelines, we will respond to every suggestion that gets at least 500 votes.
Go to the OneDrive UserVoice.