I'm trying to set up Zotero on a new computer and am running into repeated sync errors. The data sync seems to work, but the file sync will only run for a few seconds (processing 1-15 files at a time, out of around 1400) before it crashes. The process repeats after I restart Firefox and after I restart my computer.

The most recent debug code is 1654397112, and the error text reads:

[JavaScript Error: "Unexpected status code 403 for request null/66N3V5VU in Zotero.Sync.Storage.Session.ZFS.downloadFile()" {file: "chrome://zotero/content/xpcom/storage/zfs.js" line: 278}]

[extra output removed — D.S.]