How do I add a file to existing Secure Note

Hi @DerekHan, thanks for your response! You're correct here - on our website, file attachments can only be added to items in the Document category. You can use the desktop app to add attachments to any other item types. We do apologise for any inconvenience caused here, and if full attachment support on 1Password.com is something you'd be interested in seeing, I would be happy to file a feature request for this on your behalf - just let me know!