OneDrive Files Stuck and Not Syncing

Before doing anything else: your files are not at risk. OneDrive keeps a 30-day version history for every file, and the fixes that resolve sync errors don’t touch file content. The data is there — it’s the sync connection that needs resetting. You’ll find the complete rundown in our Complete Guide to Fixing Windows, Browser, and Software Errors.

The fastest fix that resolves most OneDrive sync problems in under a minute: right-click the OneDrive icon in the system tray → Pause syncing → wait 10 seconds → Resume syncing. If the spinning icon persists after another minute, fully quit OneDrive (right-click → Quit OneDrive), then restart it from the Start menu. This clears stuck syncs in the majority of cases without touching any settings.

Only if that doesn’t work — work through the fixes below.

The most common errors and their fixes

Storage quota exceeded: your OneDrive storage is full. Files stop uploading the moment you hit the limit. Solution: either delete files from OneDrive to free space, or upgrade the storage plan. Check your usage: onedrive.live.com → see the storage bar at the bottom of the left sidebar. Alternatively, from the OneDrive icon → Settings → Account → see free space and manage storage.

File name or path too long: OneDrive has a 400-character maximum path length (including the full folder hierarchy and filename). Windows allows longer paths but OneDrive can’t sync them. Files in deeply-nested folder structures, or files with very long names, fail silently or with this specific error. Fix: rename the file shorter, rename parent folders shorter, or restructure the folder hierarchy to reduce nesting depth.

File type not supported / file in use: some file types (temp files, system files, certain database files with active locks) can’t be synced. If an application has a file open with an exclusive lock (SQLite database, Outlook .pst file, VirtualBox disk images), OneDrive can’t read it to sync. Close the application that owns the file, or exclude that folder from OneDrive sync (OneDrive settings → Account → Choose folders → deselect the folder).

Invalid characters in filename: OneDrive doesn’t allow these characters in file or folder names: / : * ? " < > |. Files with these characters in the name can’t sync. Rename them removing the special characters.

Restart OneDrive sync completely

OneDrive’s sync engine sometimes gets stuck in a bad state — not a specific file error, just the whole thing frozen. The restart:

1. Right-click OneDrive in system tray → Close OneDrive (not just pause)
2. Task Manager → verify no OneDrive.exe processes remain → end any that do
3. Win+R → type: %localappdata%MicrosoftOneDriveOneDrive.exe → Enter
4. OneDrive restarts → watch for sync activity indicator returning to the tray

This is the “turn it off and on again” for OneDrive specifically, and it resolves a large number of “stuck syncing” situations where no specific error is reported — the sync engine just needs a fresh start.

Sync conflicts — two versions of the same file

When a file is edited on two devices before OneDrive has synced: you get a conflict. OneDrive creates a second copy with “(device name’s conflicted copy)” in the filename rather than silently overwriting. This is the right behaviour — you don’t lose changes — but people often don’t realise what happened.

Look in your OneDrive folder for files with “conflicted copy” in their name. Compare the two versions, keep what you need, delete the conflict copy. Once deleted: sync resumes normally for that file. You can also use OneDrive’s version history (right-click file in File Explorer → OneDrive → Version history) to see previous versions without a conflict copy being created.

Account connection and sign-in

If OneDrive shows “Account disconnected” or prompts you to sign in: the authentication token expired or was invalidated. This happens after password changes, MFA re-enrollment, or the token timing out after extended inactivity.

Click the OneDrive icon → sign in → re-enter credentials. If on a work account (Microsoft 365): your IT admin may have changed authentication policies requiring re-enrollment. After signing in, sync resumes automatically for all connected files.

Our guide on OneDrive not syncing covers the more severe syncing failures including reset procedures, and our File Explorer and cloud folder troubleshooting covers the File Explorer-level symptoms of sync problems. For understanding sync errors and OneDrive’s storage policies, Microsoft’s OneDrive support covers all error codes and the specific file type restrictions in detail.

Excluded folders and selective sync

OneDrive’s selective sync lets you choose which folders sync to a specific device. If a folder shows in the cloud (visible at onedrive.live.com) but isn’t in File Explorer on your machine: it’s been excluded from sync on this device.

OneDrive tray icon → Settings → Account → “Choose folders” → see which are selected. Any unchecked folder won’t sync to this device (though it stays in the cloud). Check the folders you need → OK → OneDrive downloads them. This is useful when one device has limited storage — you pick which subsets sync locally while everything remains available in the cloud.

Files On-Demand is related: Settings → OneDrive tray → Settings → Sync and backup → “Files On-Demand” → saves space by keeping files as placeholders (cloud icon in File Explorer) rather than full local copies. Double-clicking a placeholder downloads it. If files show as “Online-only” and won’t open without internet: Files On-Demand is enabled. Right-click any file or folder → “Always keep on this device” to make it always available offline.

Throttling and bandwidth limits

OneDrive can throttle its own upload and download speeds to avoid consuming all available bandwidth. Settings → OneDrive tray → Settings → Sync and backup → “Advanced settings” → Network limits → check if upload or download rate is limited to a low value. Set to “Automatically adjust” or a higher cap for faster syncing.

Also: in home environments, large sync operations (first setup, syncing a huge new folder) can saturate upload bandwidth, slowing internet access for everyone else on the network. Throttling is actually useful in this scenario — set upload to something reasonable (5-10 Mbps) during the day and let it catch up overnight.

OneDrive on work accounts — admin restrictions

Microsoft 365 work accounts have OneDrive policies set by the organisation’s IT admin. Common restrictions that cause sync issues:

• Maximum individual file size (sometimes set to 10GB rather than the default 250GB)
• Blocked file types (executables, certain video formats)
• Syncing to unmanaged devices disabled (personal laptops with a work OneDrive account)
• External sharing disabled (affects which folders you can receive shared from others)
• Conditional access policies requiring managed devices or MFA for OneDrive access

If files that should sync don’t, and no obvious error appears: contact your OneDrive admin. They can see sync status and policy errors from the admin console that individual users can’t access.

The OneDrive reset — when nothing else works

A full OneDrive client reset clears cached credentials, local sync state, and connection information, forcing a fresh sync from scratch. This is the nuclear option for persistent sync failures:

%localappdata%MicrosoftOneDriveonedrive.exe /reset

Run this in Win+R. OneDrive closes, resets, and reopens (it may take a minute). After reset: sign in again if prompted → OneDrive re-scans the cloud and re-establishes sync for all connected folders. Files already synced to the local folder aren’t deleted — OneDrive reconciles the local copies with the cloud state.

Note: after a reset, the initial sync takes longer than usual as OneDrive re-indexes everything. Don’t interrupt it. For large OneDrive setups (500GB+), this can take hours. Leave the machine on overnight if needed.

Error / behaviour	Cause	Fix
“Storage quota exceeded”	OneDrive is full	Delete files or upgrade storage plan
Specific file won’t sync	Long name, invalid chars, file in use	Rename file; close owning app; check path length
Sync stuck spinning, no error	Sync engine frozen	Close OneDrive → restart via .exe path
Folder in cloud but not local	Selective sync excluding it	OneDrive settings → Account → Choose folders → check it
Duplicate files with “conflicted copy”	Edit conflict between two devices	Merge changes; delete conflict copy
Account disconnected message	Auth token expired	Sign in again via OneDrive tray icon

OneDrive sync errors are usually specific and self-describing once you look at the tray panel’s error messages. The pattern of “read the error → fix the named thing → file syncs” handles a large majority of cases. The engine restart handles the “frozen with no error” scenario. The reset is for the persistent failures that survive both.

Sync and antivirus interference

Antivirus software that scans files as they’re written can interfere with OneDrive’s sync process — OneDrive tries to complete writing a file, the AV locks it to scan, OneDrive can’t finalise the upload, timeout occurs, error flagged. This is especially common with real-time scanning on machines running older antivirus versions that haven’t been updated for OneDrive’s current sync protocol.

Fix: add the OneDrive folder (default: C:Users[yourname]OneDrive) to the antivirus exclusion list. Most AV software allows folder exclusions while keeping all other protection active. Microsoft Defender does this: Windows Security → Virus & threat protection → Manage settings → Exclusions → Add an exclusion → Folder → select your OneDrive folder.

Note: excluding the OneDrive folder from real-time scanning does reduce protection for files in that folder specifically. If you download untrusted content to OneDrive: balance this trade-off accordingly. For most users whose OneDrive contains documents, photos, and personal files: the exclusion is safe.

OneDrive Mobile and sync parity

If files sync correctly on one device (say, your phone’s OneDrive app) but not your Windows PC: the issue is specific to the Windows OneDrive client, not your account or the files themselves. This quickly narrows the fix to the Windows client — restart, reset, or reinstall specifically on Windows without worrying about account settings.

The reverse is also useful: if OneDrive.live.com in a browser shows all your files correctly → the cloud is fine and the files are there → the Windows sync client can’t reach or read them properly. This distinguishes “cloud problem” from “client problem,” pointing directly at the Windows OneDrive client as the issue.

Bandwidth and the sync queue

OneDrive processes files one at a time in a queue. Very large syncs (moving thousands of files into OneDrive at once) take a long time not just because of file size but because OneDrive processes each file sequentially with metadata operations. During a bulk sync, specific files appearing to not sync are usually just waiting in queue — they’re fine, just not at the front yet.

Practical patience: after a large paste or move operation into OneDrive, allow 30-60 minutes before concluding that something isn’t syncing. The processing queue for 10,000 files with total 50GB of data can take hours. The OneDrive tray icon shows overall progress and typically shows “X items remaining” which decreases over time as the queue processes.

OneDrive version history as a safety net

Separate from syncing problems: OneDrive’s version history (right-click any synced file → OneDrive → Version history) retains previous versions for up to 30 days (personal) or 180 days (Microsoft 365 business) automatically. This is useful when a file gets overwritten or corrupted during a sync conflict.

If a file appears in OneDrive but with wrong or old content after a sync issue: check version history before assuming data loss. The version you want is often there. Restore it directly from the web browser if the Windows client is currently having issues.

Reinstalling OneDrive

If the reset command doesn’t resolve persistent sync failures and errors continue: uninstall and reinstall OneDrive. Settings → Apps → Microsoft OneDrive → Uninstall. After uninstalling: Win+R → %localappdata%MicrosoftOneDrive → delete any remaining folders. Download the fresh installer from microsoft.com/onedrive → install → sign in. This is a clean state with no residual configuration from the problematic install.

Your files remain in the OneDrive cloud — uninstalling the client doesn’t delete anything from the cloud. After reinstall, OneDrive syncs everything down fresh. Files already on your local drive from the previous install will be matched with cloud versions; duplicates won’t be created for files that match.

For persistent OneDrive problems that survive reinstall: check Microsoft 365 service status (status.microsoft365.com). OneDrive service incidents occur occasionally and will look like client problems even when the client itself is fine. A 20-second check of the status page can save hours of fruitless troubleshooting.

OneDrive sync problems are genuinely self-describing in most cases — the error messages in the tray panel are specific and actionable. The gap between “OneDrive isn’t syncing” and “here’s why it isn’t syncing” is usually just reading what’s in the tray panel rather than dismissing the icon. Five seconds of reading saves 30 minutes of troubleshooting. When there’s no specific error (engine frozen, quota ambiguous, authentication silent failure): the restart and reset procedures restore normal sync reliably.