[JavaScript Error: "Inactivity timeout for GET https://api.zotero.org/users/19491451/items/7PLIYQ3K/file -- aborting request"]
[JavaScript Error: "Request timed out after 30000 ms"]
[JavaScript Error: "Download request 1/7PLIYQ3K failed"]

This is likely a problem with your internet connection, but if you provide a Debug ID (different from a Report ID) for a sync attempt that fails, we can confirm.