Report ID: 992590262

I am getting a Zotero file sync error in the desktop app. I've been getting this error repeatedly over the last week or more. Have tried restarting Zotero and Windows multiple times without resolutation.

In all three cases below, the files referenced seem to be html snapshots. They appear as attachments to a library item, but an error appears when accessing them that they have been deleted or moved.

But I have not yet made manual changes to the Zotero storage folder. Please let me know whether this looks like a local file-lock/permissions/security-software issue and what steps I should take next.

System details:
- Zotero version: 9.0.3 (x64)
- OS: Windows 11 26100
- Data directory is: C:\Users\\Zotero

Relevant errors from the report include:

Could not remove C:\Users\\Zotero\storage\7W5ZBT7Z (NS_ERROR_FILE_ACCESS_DENIED)
Download request 1/7W5ZBT7Z failed

Could not remove C:\Users\\Zotero\storage\X2Z9FJNM (NS_ERROR_FILE_ACCESS_DENIED)
Download request 1/X2Z9FJNM failed

Could not remove C:\Users\\Zotero\storage\RMKBDHA9 (NS_ERROR_FILE_ACCESS_DENIED)
Download request 1/RMKBDHA9 failed

The problem occurs when I try to sync Zotero. It appears to be failing while syncing attachment files, not while editing citations or using the word processor plugin.

Steps to reproduce:
1. Open Zotero desktop.
2. Click the sync button / allow automatic sync to run.
3. Zotero reports a file sync error.
4. The error report shows NS_ERROR_FILE_ACCESS_DENIED when Zotero tries to remove folders in the local storage directory.