137698221 - Sync error

The main symptom seems to be attached pdf files aren't syncing; the parent items and folders do without a problem. I'm not sure what I did to cause this error, I've been using Zotero in the same way for months, although I have just started a new job and am therefore using a new internet connection.

[JavaScript Error: "Request failed in Zotero.Sync.Storage.StreamListener.onStopRequest() (2152136706)" {file: "chrome://zotero/content/xpcom/storage/streamListener.js" line: 96}]
[JavaScript Error: "Unexpected file upload status 0 in Zotero.Sync.Storage.ZFS.onUploadComplete() (0_XCRSCWC2)" {file: "chrome://zotero/content/xpcom/storage/zfs.js" line: 557}]
[JavaScript Error: "(null)" {file: "chrome://zotero/content/xpcom/storage/zfs.js" line: 558}]
[JavaScript Error: "A file sync error occurred. Please try syncing again.
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