After reaching the 4F Spacetime Rift and defeating Broly, go to the top left of the area following your spaceship. From here, you will be able to see a hole in a cliff, this will mean that you are in the right place. Hold the X button to increase your Ki and find a Spacetime Rift! (image1)
Go to the rift and interact with it to meet Camarbo (pictures2and3). This character will ask you to take him to a safe place. Go to the top of the map without being attacked and drop Camarbo on the platform as shown in the image below in order to end this secondary mission (pictures4to6).