Courtsey- Microsoft support, Community , Video How to Sync , Repair One Drive
Fix OneDrive for Business sync problems
If you don’t have the OneDrive for Business sync app, you can download it free.
Step 1: Make sure that the OneDrive for Business sync app is up-to-date
OneDrive for Business is frequently updated. Make sure that you have the most current version of OneDrive for Business installed.
Step 2: Make sure that your file and folder names don’t contain unsupported characters or invalid file types
If a file or folder name contains certain characters or file types, you won’t be able to sync those files. Review the list of invalid characters and file types, and change any file or folder names, or remove the file types that aren’t supported.
Step 3: Make that sure your file sizes, items counts, and file path lengths are within the limits
If a file you’re trying to sync is too large, or if you’re trying to sync too many items, OneDrive for Business sync might not work. Review the limits for the size and number of files that can be synced, and make sure the files you’re trying to sync don’t fall within the listed restrictions or limitations.
Step 4: Repair a OneDrive for Business sync connection
Follow these quick steps to repair a sync connection with OneDrive for Business, and see if that fixes your sync problem.
Step 5: Stop and restart syncing for a OneDrive for Business library
Step 6: Use the OneDrive for Business Sync Issues Troubleshooting Guide
If you’re still experiencing sync problems, try the OneDrive for Business Sync Issues Troubleshooting Guide. This tool can help guide you through diagnosing and resolving issues with libraries you’re currently syncing.
Still having sync issues?
If you’re still having sync issues, try posting a question in the Office 365 community forums. They’re a great resource, and they’re monitored by Microsoft support agents who can help if you’ve tried the steps here and are still stuck. You can also contact Office 365 for business support.
Number of items that can be synced
- You can sync up to 20,000 items in your OneDrive for Business library. This includes folders and files. You can also sync up to 20,000 items for each additional OneDrive personal site that you may have access to.
- You can sync up to 5,000 items in a SharePoint library. This includes folders and files. These are the libraries that you find on various SharePoint sites, such as team sites and community sites, libraries that other people created, or that you created from your Sites page. You can sync multiple SharePoint libraries.
Size limit for syncing files
In any SharePoint library, you can sync files of up to 2 gigabytes (GB).
Character limit for files and folders
These limits apply to files and folders that you add to a synced library folder for uploading to SharePoint.
- In SharePoint Server 2013, file names can have up to 128 characters.
- In SharePoint Online, file names can have up to 256 characters.
- Folder names can have up to 250 characters.
- Folder name and file name combinations can have up to 250 characters.
The following characters in file or folder names aren’t supported when you sync OneDrive for Business with SharePoint Online:
Additionally, a file or folder name that begins with a tilde (~) isn’t supported.
SharePoint Server 2013
The following characters in file name aren’t supported when you sync OneDrive for Business with SharePoint Server 2013:
A file name that begins with a period (.) or a tilde (~) isn’t supported.
Unsupported folder names
When you sync OneDrive for Business with SharePoint Online or SharePoint 2013, a folder named “forms” isn’t supported at the root level for a list or library. This occurs because “forms” is a hidden default folder that’s used to store templates and forms for the library. Additionally, a folder that contains the string _vti_ is reserved by SharePoint, and isn’t supported.
The following folder names can be synchronized in OneDrive for Business and SharePoint Online. However, if they’re synchronized, they won’t appear when you view the library on the SharePoint Online or OneDrive for Business webpage. With some of these restrictions, you may be unable to add files or folders that have these characters while in the OneDrive for Business folder. However, if you create the files or folders outside OneDrive for Business and then drag those files or folders into the OneDrive for Business folder, the files and folders will sync but the files won’t appear on the webpage.
GUID strings as file names
The GUID string structure is supported in SharePoint Online.
The following GUID string structure isn’t supported for file names in SharePoint 2013:
For example, a GUID that matches this structure resembles the following:
Invalid file types
You can’t upload files that have a *.tmp or *.ds_store extension, and you can’t upload desktop.ini, thumbs.db, or ehthumbs.db files.
Additionally, you can’t upload files whose file types are blocked on the SharePoint site. If your organization is running SharePoint Server, the list of blocked files may vary, depending on what your administrator sets up. If your organization is running SharePoint Online, the default list of blocked files is fixed and can’t be changed. To see a list of the default blocked files, go to the following Microsoft website: