Some attachments won't upload to WebDAV server

edited September 15, 2026
Hi,

a few months ago, I have moved to a new desktop client (Linux flatpack - I hope this is the right place to post). I don't remember the exact procedure of moving my items, but I was basically copying the Zotero user directory.

Now, after some changes, I want to sync my library again. For that I use WebDAV, probably outdated because the software it ships with hasn't updated it in a while (or rather: hasn't updated Nextcloud in a while, which includes WebDAV). Zotero's "verify server" function, however, reports no issues.

Out of a few hundred attachments, most sync, but 25 fail to. Errors are thrown only for a few attachments at a time, until the sync process gets stuck. It only continues after deleting the corresponding directories and restarting.

The problematic files are mostly big in size, but not exclusively. Their types are PDF, pptx, mp4, html.

I disabled all plugins and did both available sync resets, with no success. Removing the files and re-importing them also did not work. I wonder what makes these files different. If it helps, I can provide some of them.

Error log after trying to sync all 25 problematic files:

-------------------------------------------------------------------------

[additional errors removed — D.S.]

[JavaScript Error: "NS_ERROR_FILE_NO_DEVICE_SPACE: Component returned failure code: 0x80520010 (NS_ERROR_FILE_NO_DEVICE_SPACE) [nsIZipWriter.close]" {file: "chrome://zotero/content/xpcom/file.js" line: 1535}]
onStopRequest@chrome://zotero/content/xpcom/file.js:1535:16

appName => Zotero, version => 10.0.1 (x64), os => Linux 6.18.46-1.qubes.fc41.x86_64 #1 SMP PREEMPT_DYNAMIC Thu Aug 27 08:29:20 UTC 2026, locale => en-US, extensions => Actions and Tags for Zotero (2.6.1, extension, disabled)

-------------------------------------------------------------------------

My Report ID is D434081606.

Many thanks for every hint!
  • That's just saying you're out of disk space. If that's the case, you should fix it. Otherwise, it's likely due to the third-party package you're using, which we can't help with.

    https://www.zotero.org/support/installation#linux
  • Thanks.

    It might actually be an issue with the third-party flatpak, or me upgrading to an unstable flatpak branch previously to get Zotero 10.

    Now I finally installed the app the official way, and synchronizing previously problematic files now works fine! Great work.

    I hope however that I'll find an easier way to upgrade as opposed to unzipping and running shell scripts, as I only do upgrades in a non-networked template file system using apt or a proxy, and optimally not starting Zotero (which rules out the built-in update feature).
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