What to do in case of a 'Unknown network error'?
If the upload process is being executed correctly, but you get an 'Unknown Network Error' message that prevents the completion of the upload process, it typically indicates that the browser is failing to encrypt files before uploading. This can happen on either older unsupported browsers or (more commonly) when users have certain JavaScript blockers or extensions enabled. We recommend attempting the upload using a different browser without extensions or blockers.