Troubleshooting Symlink Sync Issues in Drive for Desktop

When you place symbolic links (symlinks), directory junctions, or aliases inside Google Drive for Desktop folders, the client often fails to synchronize the underlying target data. Instead, Drive for Desktop may either ignore the link, upload an empty or unreadable shortcut pointer file, get trapped in an endless indexing loop, or report a local file access failure.

Fast Fix

Google Drive for Desktop does not traverse symbolic links to back up external target data. To synchronize content located outside your default Drive folder, remove the symlink and add the actual physical target directory directly via Google Drive Preferences > My Computer / Other Folders > Add folder.

Diagnostic Snapshot

Parameter	Specification
Affected Client	Google Drive for Desktop (Windows NTFS & macOS APFS/HFS+)
Primary Symptom	Target files missing from web interface, symlink uploaded as a 0-byte or corrupted pointer, sync engine stuck on “Syncing” or “Checking for updates”
Direct Cause	Sync engine deliberately ignores link traversal to prevent circular loops and file lock deadlocks
Admin Access Required	No for folder re-mapping; Yes if managing central client deployment policies

Forensic Decision Path

Follow this path to identify how your operating system’s link structure is failing inside Drive for Desktop:

[Symlink Fails to Sync Target Data]
  │
  ├─► Is the symlink inside "My Drive" (Streaming mode) pointing to a local external folder?
  │     └─► Cause: The virtual drive engine cannot resolve local filesystem pointers outside its mounted namespace.
  │
  ├─► Is the symlink inside a "Mirrored" local folder?
  │     ├─► Symlink uploads as a broken shortcut / 0-byte file ──► Drive treats link as a raw pointer, not the target directory.
  │     └─► Sync engine loops indefinitely ────────────────────► Circular link / recursive directory reference detected.
  │
  └─► Is the symlink an NTFS Directory Junction or macOS Hard Link?
        ├─► Junction: May sync initially but fails to detect subsequent real-time change events.
        └─► Hard Link: Often triggers hash mismatches and metadata desynchronization.

What This Means: System Mechanics

Google Drive for Desktop relies on filesystem notification APIs (ReadDirectoryChangesW on Windows and FSEvents on macOS) to track file additions, edits, and deletions in real time.

When dealing with symbolic links:

1. Link vs. Target Distinction: A symlink is just a metadata pointer containing a text string path to a target file or folder elsewhere on your drive.
2. Traversal Prevention: To prevent infinite recursive loops (where Folder A links to Folder B, which links back to Folder A), Google Drive’s sync engine does not automatically follow or resolve filesystem pointers to their remote targets.
3. Missing File System Notifications: Changes made inside the original target folder outside the Drive directory tree do not send change notifications to the symlink pointer itself. Consequently, the sync engine never knows an edit occurred.

Common Causes

• Using Symlinks for External Folder Backups: Creating a symbolic link inside G:\My Drive pointing to D:\Projects will not back up the contents of D:\Projects. Drive only syncs the small local pointer file.
• Recursive Directory Traversal: Nested directory links that reference parent directories create circular paths, causing GoogleDriveFS.exe to run out of memory or crash silently.
• Operating System Permission Locks: Under Windows, creating and resolving certain symbolic links requires elevated permissions. Without them, Drive for Desktop cannot read the link target and throws a local permission error.
• File System Driver Incompatibility: In virtualized or multi-user environments, user-profile redirection paths that rely on directory junctions often fail to mount.

Common Misdiagnoses

• Misdiagnosis: “The sync engine has crashed or network connectivity is blocked.”
  • Distinction: A network failure results in a “Disconnected” or “Can’t reach Google Drive” message. If the app is active and online but specific folders simply refuse to update, the issue is folder link traversal, not network filtering.
• Misdiagnosis: “The local cache database is completely corrupt.”
  • Distinction: While clearing the cache resets the client, it will not enable symlink support. Once the cache rebuilds, the symlinks will still be ignored.

Resolution Steps

Step 1: Remove Conflicting Links from Google Drive

1. Open Windows File Explorer or macOS Finder.
2. Navigate to your local Google Drive folder.
3. Locate the symbolic link, junction, or alias.
4. Delete the link object. (Deleting the link pointer does not delete the original target data on your computer).

Step 2: Add the Physical Source Folder Directly (Recommended)

Instead of linking folders into Drive, use Drive for Desktop’s native folder backup feature:

1. Click the Google Drive icon in your system tray or menu bar.
2. Click the Settings gear > Preferences.
3. Select My Computer (or My Mac) in the left sidebar.
4. Click Add folder.
5. Browse directly to the real physical directory (e.g., D:\Projects) and select it.
6. Choose Sync with Google Drive and click Done > Save.

Google Drive Preferences
└── My Computer / My Mac
    └── Add folder ──► [Select Physical Folder: D:\Projects] ──► Sync with Google Drive ──► Save

Step 3: Invert the Structure (Use Drive as the Primary Host)

If external software requires files to reside at a specific local path while you still need them synced to Drive:

1. Move the actual physical folder into your Google Drive directory (e.g., G:\My Drive\Projects).
2. Create the symbolic link at the external location pointing into Google Drive, rather than the other way around:
   • **Windows (Command Prompt as Administrator):**DOS mklink /D "C:\Users\Username\Projects" "G:\My Drive\Projects"
   • **macOS (Terminal):**Bash ln -s "$HOME/Library/CloudStorage/GoogleDrive-user@domain.com/My Drive/Projects" "$HOME/Projects"

This configuration ensures Google Drive syncs the real physical files natively while third-party tools access them through the local symlink.

Admin & Advanced Checks

• Identify Ghost Symlinks via Command Line: To inspect whether broken links are stalling the sync queue on a Windows endpoint, run:DOS dir /a:l /s "C:\Users\%USERNAME%\Google Drive" This command lists all symbolic links, junctions, and reparse points within the directory tree.
• Audit File System Filter Drivers: Certain backup software and endpoint protection tools inject filesystem filter drivers that intercept link resolution. Run fltmc in an elevated command prompt to review active filter drivers if file pointers fail globally across the device.

Hard Stops

• Circular Link Loops in Automated Scripts: If custom batch or shell scripts dynamically generate symlinks inside folders monitored by Drive for Desktop, stop those scripts immediately. Infinite recursive symlink chains can exhaust disk handles, saturate CPU resources, and trigger repeated client lockouts.