OneDrive File Issues

Fix OneDrive Sync Problems and Renamed Files After an Update

Maira Mehtab Sep 22, 2026 869 views

Question details

The user is experiencing synchronization failures, automatic file renaming, and older versions overwriting newer files in OneDrive following a software update.

Product: OneDrive
Device & OS: not provided
Scenario: Synchronizing and managing files after a OneDrive application update.
Observed behavior: Files are automatically renamed, some Excel files fail to sync, backup software detects widespread unexpected changes, and older file versions appear to overwrite newer ones.

Before you start

Before modifying configuration files or resetting your OneDrive client, verify your local files and back up any critical un-synced documents to a separate folder to prevent accidental data loss.

Solution 1Recommended

Resolve Unsupported Filenames and Path Lengths

Identify and rename files that OneDrive has flagged or renamed due to unsupported characters or excessively deep folder structures.

OneDrive has strict guidelines for file names and paths. If a recent update enforced these rules more aggressively, files with special characters or very long paths might stop syncing or be automatically renamed.

Identify renamed files

Review the files that were automatically renamed by OneDrive to spot common patterns, such as the removal of special characters or truncation.

Check file path lengths

Navigate through your OneDrive directories to ensure that your folder structures are not too deeply nested. The total path length (including the file name) should not exceed 400 characters.

Rename files manually

Right-click the problematic files, select 'Rename', and remove any unsupported characters (such as <, >, :, ", |, ?, *, /, \) before attempting to synchronize again.

Microsoft Guidance: Review Microsoft's official guidance on invalid file names and file types in OneDrive for a complete list of restricted characters.

Solution 2

Verify OneDrive Account and Folder Sync Settings

Ensure that the correct account is signed in and that your desired folders are accurately configured for synchronization.

Solution 3

Reset the OneDrive Client

Resetting the OneDrive application can resolve persistent underlying sync conflicts without deleting your local files.

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Frequently Asked Questions

Why does OneDrive rename my files automatically?

OneDrive typically renames files if they contain unsupported characters, if the path length exceeds system limits, or if multiple files share the exact same name during a sync conflict (often appending the device name to the file).

Will resetting OneDrive delete my local files?

No, resetting the OneDrive client only clears the synchronization cache and restarts the sync engine. Your local files and the files already backed up to the cloud will remain completely intact.

How do I fix Excel files that are not syncing in OneDrive?

First, ensure the Excel file is not currently open or locked by another application. If the file is closed, verify its name and path length, ensure your OneDrive account is properly signed in, and check for any paused sync processes.

What is the maximum file path length supported by OneDrive?

The entire file path, which includes the file name, extension, and all parent folders, must not exceed 400 characters. If the path is longer, OneDrive will fail to sync the file until it is moved to a shallower directory or renamed.

Document & File Issues