Primal iOS or Android? If you’re on Android, then you can connect CoinOS to your Primal app via NWC and zap directly within the wallet. If you’re on Primal iOS you are limited to only the built in wallet for sending zaps (you can receive to any lightning address, however). If you’re on iOS and can’t use the built in Primal wallet, then you’ll need to switch to a different nostr app in order to send zaps. Nostur on iOS is a great client and you can connect CoinOS to it via NWC for sending.