How to make an interactive iPad presentation
Self-playing or interactive Keynote presentations on iPad
You can set your presentation to advance automatically, like a movie, with no interaction needed. Or you can set up an interactive presentation that changes slides only when the viewer taps its links. You can also set a presentation to play continuously in a loop, and to restart if the presentation sits idle for a specific period of time.
These options are particularly useful when the presentation is played in a kiosk setting.
Make an interactive presentation or one that advances automatically
With the presentation open, tap the down arrow next to the file name or the 
.
Tap Settings, tap Presentation Type, then tap one of the following:
Links Only: Changes slides only when the viewer (or presenter) taps a link.
Self-Playing: Advances automatically, with no interaction needed.
To make the presentation restart automatically, turn on Restart Show if Idle, then drag the slider to set the amount of idle time before a presentation restarts.
If there hasn’t been any interaction with the screen after the specified period of time, the presentation returns to the first slide.
To make the presentation continuously repeat, turn on Loop Slideshow.
Tap outside the Presentation Type menu to dismiss it.
To play the presentation, tap to select the slide you want to begin with in the slide navigator, then tap
Link to source.
https://support.apple.com/guide/keynote-ipad/self-playing-or-interactive-presentations-tan80c0ac284/ipados