📖 We've addressed some issues with application protocols in this release: Buttercup uses the buttercup protocol to register a handler on the host OS. This allows Buttercup to be notified by the browser when procedures like Google authentication is completed for accessing vaults stored on Google Drive.
❗ Users running the AppImage version of Buttercup desktop should install AppImageLauncher (see our readme) for correct OS integration. Protocol registration (and reliant features, like Google authentication) will not work without it.