Once you are inside a retrospective adding GIFs onto cards can be done by dropping a http link to the gif on the card input and hitting enter.
Give this one a try!
https://media.giphy.com/media/3o7btNa0RUYa5E7iiQ/giphy.gif

Once you are inside a retrospective adding GIFs onto cards can be done by dropping a http link to the gif on the card input and hitting enter.
Give this one a try!
https://media.giphy.com/media/3o7btNa0RUYa5E7iiQ/giphy.gif