Choosing betwwen camera apps android


A couple of times when i have been using the android app and pressed on the camera icon to take a pic it has offered me a choice of camera apps which is great but when i have tried to repeat it to choose a different camera app it does not give me a choice is there a trick to bring up the choice?

The other thing that has happen it has just used a different app at random is the a way to preset which app it uses?