If you can't sync files from your computer to OneDrive, or if the sync is too slow, the following steps will guide you through the possible solutions.
Step 1: update your OneDrive app and software
Step 2: check the file name
OneDrive for Business doesn’t support certain characters in a file name. Avoid these characters to prevent sync problems.
Step 3: check the file size
A file that’s too large, contains too many items, or has a long access path, can’t be synced to OneDrive for Business. Respect the pre-defined limits for files.
Step 4: reset the sync connection
Sync problems can often be solved by restarting the sync connection.
Step 6: Consult the OneDrive for Business manual
If you’re still having problems with the sync after following these five steps, consult the OneDrive for Business manual.