Koofr WebDAV verifies successfully, but PDF attachments are not uploading

Hello,

I am using Zotero on macOS and trying to sync my attachment files with Koofr via WebDAV.

The WebDAV server verification is successful, and Zotero displays:

“Server configuration verified — File sync is successfully set up.”

However, PDF attachments are not being uploaded to Koofr. The “zotero” folder in my Koofr account remains empty, and Koofr still shows 0 MB of storage used.

My current settings are:

- “Sync automatically” is enabled.
- “Sync attachment files in My Library using WebDAV” is enabled.
- WebDAV address: https://app.koofr.net/dav/Koofr
- I am using a Koofr application-specific password.
- “Verify Server” completes successfully.

I have already tried:

- Adding newly downloaded PDF files to Zotero
- Confirming that the PDFs are stored inside the local Zotero/storage folder and are not linked files
- Manually clicking the Zotero sync button
- Resetting File Sync History for My Library
- Syncing again after the reset

The sync icon rotates for only a few seconds and then stops, but no attachment files appear in Koofr.

Debug ID: D1781502589

Could you please check the debug output and help me identify why the WebDAV attachments are not being uploaded?

Thank you.
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