How do I attach encrypted files to my notes?

You can use the FileSafe extension to attach files to your notes. Files are encrypted offline first, then uploaded to your chosen cloud provider, such as Dropbox, Google Drive, or any WebDAV compliant server (Nextcloud, ownCloud, Seafile, Synology, and others).

You can learn more about FileSafe, or, if you're interested in accessing FileSafe, subscribe to Standard Notes Extended.