If you can't sync files between your computer and OneDrive for Business, it might be due to problems with the OneDrive for Business sync client. Try the steps in this article to fix the problem.
This article covers sync using the longtime OneDrive for Business sync client, not the new OneDrive for Business Next Generation Sync Client. Which OneDrive sync client am I using?
Step 1: Make sure that the OneDrive for Business sync app is up-to-date
OneDrive for Business is frequently updated. Make sure you have the most recent updates.
Tip: If you sync only OneDrive for Business accounts associated with Office 365, you might be able to use the OneDrive for Business Next Generation Sync Client. To find out more, see Get started with the OneDrive for Business Next Generation Sync Client in Windows. If you're using a Mac, see Get started with the OneDrive for Business Next Generation Sync Client on Mac OS X.
If you don’t have the OneDrive for Business sync app, you can download it free.
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 sure that 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 the sync and restart
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.
If you recently upgraded from Office 2013 to Office 2016 and OneDrive for Business isn't working properly, see one of the following articles: OneDrive for Business is uninstalled after you upgrade to Office 2016 or OneDrive for Business stops syncing libraries, or the icon overlays don't appear on synchronized files and folders after you install Office 2016.
A recent product update introduced an issue for some Office 2013 users who receive a “Credentials needed” prompt. To fix this, see October 21, 2015, update for Office 2013 (KB2986219).