File Locking

Last updated on May 19, 2023

Nasuni Access Anywhere provides federated locking services across all mapped storage providers, even if those storage providers don’t support locking themselves.

Appertains to:

  • SaaS hosted Service
  • IaaS Use
  • Enterprise on-premises use


A critical feature of shared file systems, file locking is a protection mechanism that prevents two users from editing the same file at the same time. Within Access Anywhere the first user “locks” the file before editing. The lock is added to the file metadata tracking who made the lock and when. When a second user attempts to edit the same file, the behavior depends on how the user attempts to open the file.

  • If they are opening the file through the Mac or Windows Cloud Drive, the file will be opened for read access in the associated editor (for example Microsoft Word in the case of a Word document). When the user makes a change and attempts to save the file, they will be prompted to save it under a different name.
  • If the user tries to open a locked file with Cloud Edit, the file will not be opened on the desktop. Instead it may be opened for viewing automatically in one of Access Anywhere’s on-line viewing services such as the Microsoft on-line viewer for Office documents.

Automatic and Manual Locking

Access Anywhere supports automatic and manual locking. When a file is opened through a desktop application or drive, locks are created automatically in many cases. These locks are released when the file is closed.

Users can also manually lock and unlock files themselves through the drive, desktop applications and through the web-based Cloud File Manager.

Lock Permissions

Users can only unlock files they have locked. The Organization Administrator and users with Admin role can remove any lock.

Locks are not enforced for the org. admin or members with the Admin role when they open a file that is already locked by any user.

The same users can lock and unlock the same file through different applications or even computers. Note that a user can also open the same file for editing on different computers.

Starting with version 2106.07, locks are created with a 24 hour lifespan and, unless they have been extended, expire automatically after 24 hours.

Locking a file will also lock all versions.

Identifying Locked Files

Locked files are identifiable by the lock icon seen in the Cloud File Manager and in desktop and mobile applications. The files that are user has currently locked are also listed in the Cloud File Manager under LOCKS. The file metadata, viewable in the Cloud File Manager through “File Info” shows who currently has the file locked, and when they locked it.

When a user tries to open a file for editing and the file is already locked by another user, the file will be opened for read-only access. Access Anywhere does not provide an option to notify the read-only user when the file becomes unlocked.

Provider File Locks

File locking is supported with all mapped storage providers. In general direct access to the storage outside of Access Anywhere circumvents the lock. Locks for Microsoft Office, OpenOffice and LibreOffice are however synchronized with SMB filesystems.

When a user attempts to upload, update or lock a file through Access Anywhere a check is made for a lock in SMB. If the file is locked in SMB an error is returned that document is locked.

When an office application (Microsoft Office, OpenOffice or LibreOffice) opens a document through an Access Anywhere cloud drive a lock file is created. This file is detected and Access Anywhere automatically creates the same lock file in the SMB filesystem. Office applications that are accessing SMB outside of Access Anywhere will then know that the file is locked.

Automatic locking is not supported for the older Microsoft Office file formats such as .xls, .doc and .ppt. Files of these types can be locked manually from the Web File Manager or the desktop tools.

For more information see Storage File Locking.


If a file remains locked it can be because:

  • A User explicitly locks a file and forgets to unlock it.

  • If a file is locked automatically using a desktop app such as Microsoft Word and the App crashes the file then remains locked until explicitly unlocked.

Also note an Administrator can unlock files (in addition to the user who owns the lock).


When a file is being edited with collaborative editing, the file will not be locked by Access Anywhere. Another users could also edit the file without using collaborative editing. This can result in lost updates.

1 Cloud File Manager (web)

Files can be locked and unlocked from the web file managers on right click. If a file has a lock icon it is locked. Display the info panel to see who has locked the file.

2 Windows Cloud Explorer

In the Windows dedicated explorer if you double click on a file to edit then you will be prompted to lock the file prior to it being opened.

3 Windows Cloud Explorer explicit locking

Locking / unlocking   of files from the Windows explorer can also be done explicitly on right click

Files can also be easily locked / unlocked on open/save using Access Anywhere OpenOffice and Microsoft Office toolbar plug-in's.

4 Windows Cloud Drive

Locking from the Windows Virtual drive or WebDAV drive can be achieved explicitly from a right-click file action.

Also if a Microsoft office or LibreOffice file is double-clicked and opened from the drive then the file is auto-locked. The same file is auto-unlocked when the file is closed. A tray icon is shown when this occurs.

RTF files and Autodesk DWG files will also be auto-locked.

5 Legacy Cloud Drive for Mac

The Legacy Mac Drive also features explicit file locking and unlocking. Locked files can be identified on the drive by the lock icon against the file.

As with the Windows Drive if office files are launched directly from Mac Finder then they are auto-locked and auto-unlocked on exit.

5 Cloud Edit

The menu option to open Cloud Edit will not be available if the file is currently locked.

Applications launched from Cloud Edit on Windows lock files. The lock is released when the file is first saved. (Available with Windows since 12.3.23).

6 Microsoft Office Online

The Office Online editors, Word, Excel, and PowerPoint lock files on open. When the edit (the webpage) is closed the file is updated and the lock is released. This may take several minutes.

If a file is opened via Team Edit all participants can collaboratively edit the file.

7 Zoho Office

As of release 2301 editing via Zoho is not available.

Zoho editors lock files on open. The file will be unlocked on Save. If the file is opened for editing but not saved then a user has to proceed with a manual unlock from Access Anywhere.

If a file is opened via Team Edit all participants can collaboratively edit the file. The file will not be locked by Access Anywhere, which means that other users could also edit the file without using collaborative editing. This can result in lost updates.