Sometimes you don't have time to send a full response, but you want to let your contact know that you've read and acknowledged their message.
With Peerio you can send a quick acknowledgment by tapping the thumbs up button next to where you normally enter your reply.
Tapping the thumbs up icon will send a time-stamped acknowledgment
If you begin to enter a message instead, the button will switch to an airplane icon and send the message when you tap it.
You can send a quick acknowledgment to your contact by clicking the thumbs up icon next to the emoji picker in the message area of a chat.
This will send a time-stamped acknowledgment.