Sending files via the messenger service “Signal”: fast, secure, suitable for everyday use

Rolf, 74, wants to send a document that he has just written on his PC. He asks: “Is it faster than email – and more secure?” I recommend Signal to him. Rolf already has this messenger app on his cell phone. I show him how he can easily send the document he has just created on his PC using Signal. And best of all, Signal automatically encrypts messages and attachments end-to-end.