Support intro
Sorry to hear you’re facing problems. 
The community help forum (help.nextcloud.com) is for home and non-enterprise users. Support is provided by other community members on a best effort / “as available” basis. All of those responding are volunteering their time to help you.
If you’re using Nextcloud in a business/critical setting, paid and SLA-based support services can be accessed via portal.nextcloud.com where Nextcloud engineers can help ensure your business keeps running smoothly.
Getting help
In order to help you as efficiently (and quickly!) as possible, please fill in as much of the below requested information as you can.
Before clicking submit: Please check if your query is already addressed via the following resources:
- Official documentation (searchable and regularly updated)
- How to topics and FAQs
- Forum search
(Utilizing these existing resources is typically faster. It also helps reduce the load on our generous volunteers while elevating the signal to noise ratio of the forums otherwise arising from the same queries being posted repeatedly).
The Basics
- Nextcloud Server version (e.g., 29.x.x):
- Nextcloud Hub 10 (31.0.12)
- Operating system and version (e.g., Ubuntu 24.04):
Debian 12
- Web server and version (e.g, Apache 2.4.25):
Nginx
- Reverse proxy and version _(e.g. nginx 1.27.2)
Nginx
- PHP version (e.g, 8.3):
8.2.28
- Is this the first time you’ve seen this error? (Yes / No):
Yes
- When did this problem seem to first start?
- Following a major reorganization of the folder and file structure on the server
- Installation method (e.g. AlO, NCP, Bare Metal/Archive, etc.)
Bare Metal
- Are you using CloudfIare, mod_security, or similar? (Yes / No)
No
Summary of the issue you are facing:
Hello,
For several days now I’ve been facing an annoying problem. Randomly, files are being deleted following synchronization with the desktop client.
The deleted files are random, the users are random.
I don’t understand.
The only thing is a reorganization of folders from the server but… I don’t see why that would delete files on the server.
I tried reverting to version 3.17 of the desktop client without success.
Log entries
Nextcloud
Please provide the log entries from your Nextcloud log that are generated during the time of problem (via the Copy raw option from Administration settings->Logging screen or from your nextcloud.log located in your data directory). Feel free to use a pastebin/gist service if necessary.
https://cloud.iwios.fr/s/64DfMCraAqj7Yiq
Web Browser
If the problem is related to the Web interface, open your browser inspector Console and Network tabs while refreshing (reloading) and reproducing the problem. Provide any relevant output/errors here that appear.
Web server / Reverse Proxy
The output of your Apache/nginx/system log in /var/log/____:
192.168.15.11 - USER [07/Jan/2026:10:26:50 +0100] "DELETE /remote.php/dav/files/User/2025/.../BIO4.mp4 HTTP/1.0" 204 0 "-" "Mozilla/5.0 (Windows) mirall/3.17.3 (build 20251009) (Nextcloud, windows-10.0.26200 ClientArchitecture: x86_64 OsArchitecture: x86_64)"