A single Cloner with keyframes, e.g., with the Step Effector, is possible. But with a single Clone, the Group plus a six side UV is tricky.
The only stable way (AFAIK) to store the Group UV in a UV Tag (instead of frozen in a Cloner) is to have all the clones as single child objects under the Cloner for one side. (All of that is based on the fact that the images are added to the setup and not prepared per cube as a fold, which might be a lot of work.
The example above has merged those and creates an easy way to produce UV, while the Fracture Object splits Polygon groups. Those can then be animated. It is the most stable way for all parts I'm aware of. Yes, no single object is a clone with a single animation.
All of that being said, for cubes on each side, there is a different Puzzle-like segment of a larger image on them.
If you have more questions, please never hesitate to ask.
The offer to get chocolate from Switzerland is super tempting. Literally, very sweet of you! Thank you very much! But it certainly is not allowed to send food to the U.S.; I don't want to bring anyone in trouble.
Your offer made me smile, as I have visited Friends in Switzerland often or had the pleasure of being there for a while while traveling to Italy or France. (I lived in Berlin and Munich for two+ decades. So that was easy)
Your offer made me think about the decades of traveling in Europe and the little mountain of chocolate I ate. 😉 That is already a gift.
I wish for your project and look forward to the movie. Thanks for the offer!