Mac Virtual Sync – Sync error

janstieler · February 9, 2026, 4:24am

Hi,
I use the Virtual Sync Client on Mac OS 15.4.1 (24E263) and I display

Some files could not synchronised
Warnings see below

However, I cannot see any information on unsynchronised files in the client window.
But, I can see a folder on my MacOs Finder that is not synchronised. All other folders have the small cloud icon.

It’s really annoying that I get this agaion and again.
I had this problem before and could solve it because there was problems with uppercase and lowercase file names. But now I have no idea whats the problem.

Can someone explain me what I have to do?

Best

Floweb05 · February 10, 2026, 5:10pm

Hi,
What version of the client are you using? 4.0.6 ?

janstieler · February 10, 2026, 6:03pm

Yes, Nextcloud Desktop-Client Version 4.0.6 (macOS) in updates stable channel.

Floweb05 · February 10, 2026, 6:27pm

github.com/nextcloud/desktop

[Bug]: NextCloud Desktop vfs working in local cache without warning, local files deleted when virtual files environment reset.

ouvert 07:23AM - 03 Feb 26 UTC

fermé 02:55PM - 10 Feb 26 UTC

spikusmax

0. Needs triage bug os:

macOS feature:

file provider

### ⚠️ Before submitting, please verify the following: ⚠️ - [x] This is a **bug…**, not a question or a configuration issue. - [x] This issue is **not** already reported on Github (I've searched it). - [x] Nextcloud Server and Desktop Client are **up to date**. See [Server Maintenance and Release Schedule](https://github.com/nextcloud/server/wiki/Maintenance-and-Release-Schedule) and [Desktop Releases](https://nextcloud.com/install/#install-clients) for supported versions. - [x] I agree to follow Nextcloud's [Code of Conduct](https://nextcloud.com/contribute/code-of-conduct/) ### Bug description On several occasion now directories have stopped syncing (as per bug #9393). When this happens users have been able to continue working in a local cache of the directory that has stopped syncing, without any error or notice that this is happening. Work in these directories is not reflected in the Nextcloud activity log. When the virtual environment is reset, or the account added and re-added, the work that has been complete locally is removed and irretrievable. Most recently: A financial spreadsheet was created by User A in Folder X. This spreadsheet did not appear in User B's sync client. User B then created a spreadsheet with the same name in the Folder X, they also created a subfolder and put numerous PDFs in it, none of the files/folders created by User B were synced to NextCloud and no errors were given. These files are completely absent in the activity logs but there is ample evidence that the work was being done so it is not a case of 'the server ate my homework'. User B worked within this cached version of the directory for several weeks before we reset the virtual environment (to resolve not-appearing files for a different directory). Once we did this the local version of User Bs folder disappeared, attempting to access from Excel's "Recent Files" gave errors that the file no longer existed/had been moved. ### Steps to reproduce Unable to reproduce because the trigger event - a directory that stops syncing - is not reproducible - there appears no pattern in which folders stop syncing. ### Expected behavior I'd expect that all files and folders sync. I'd also expect that an error would be displayed if there are discrepancies between server and client versions, and if there was some issue with the desktop client getting updates on any given directory. ... ### Which files are affected by this bug Nextcloud Desktop VFS client ### Operating system macOS ### Which version of the operating system you are running. Mac OS 15.7.3 ### Package Official macOS Virtual files 12+ universal pkg ### Nextcloud Server version 31.0.13 ### Nextcloud Desktop Client version 4.0.6 ### Is this bug present after an update or on a fresh install? Updated to a major version (ex. 3.16.3 to 3.17.0) ### Are you using the Nextcloud Server Encryption module? Encryption is Disabled ### Are you using an external user-backend? - [ ] Default internal user-backend - [ ] LDAP/ Active Directory - [ ] SSO - SAML - [ ] Other ### Nextcloud Server logs ```shell ``` ### Additional info So far this issue has been discovered well after the the fact and haven't been captured by the debug logs can be created in the desktop client.

Reported issue, Desktop client team worked on it, the fix is coming with next release.

Temporary fix for me was to downgrade to 3.16.6.
But be aware that you may loose any data that haven’t sync.
(Forcing Sync Reset, may lead to the same data loss problem).
So if you can wait some days, I encourage you to do that…

janstieler · February 11, 2026, 12:51pm

HI,
thanks for posting the Github Issue and teh downgrade fix.

Floweb05 · February 11, 2026, 9:14pm

@janstieler “Sharing permissions menu” in Finder may not work anymore on 3.16.6, if your MacOS is up to date. Not a critical feature but wanted to warn you about it.

( Fix: Resolving file provider services based on security-scoped URL access by i2h3 · Pull Request #9159 · nextcloud/desktop · GitHub )

system · February 19, 2026, 9:15pm

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