I think there are a few creatures that move and photosynthesize.
I guess most of the problem is that, if you are travelling a long distance, it’s not worth the energy to drag the chloroplasts around.
Imagine someone offered you a 20kg backback that produced 1 sandwich per day, it’s just not worth having because it costs you more energy to move it than it produces.
Either you need to get 10 backpacks and stay in one place all the time or no backbacks and search around for food.