I wanted to try myself, but maybe you can help so I don't have to... install them on my phone to try myself, hahaha (sorry, old phone, it always runs out of memory to install new apps). Does the confirm button works like you guessed (to confirm a transaction)? Or do it trigger another thing?
Yes, it seems it triggers the deletion of the message.
When someone sends you crypto, there's just a notification (on the notification tab) informing you about it and you'll see your new balance updated automatically on the wallet tab.