Hello and thank you to those who helped me with my make a hidden object appear'. I now have buttons that reveal an image which is great. money more question. I love with drag and drop how I can undo and reset. Is there a way to reset and undo using my click to show buttons
A lot to learn about Drag&Drop. It can be set up as a Knowledge Check slide or a scored Quiz slide.
You have the possibility for a Reset button which can be added, but will not always reset everything. Moreover if it is set up as a quiz slide and you leave the slide, the answer will be blocked, cannot be reset, if you return to the slide. For a KC slide it will be automatically be reset once you leave the slide.
Depending on what you do with Object actions, Reset may need to re-enter the slide. You can find such an example in this blog: