Zoetrope animations are not visible with the naked eye.
There needs to be an interval at the frequency of the number of frames.
To view the animations you will need a stroboscope or a shutter speed camera.
-Stroboscope for iphone/ipad:
https://itunes.apple.com/app/id978182913?fbclid=IwAR0_3k-2ZnP3o8faetkNLS8afnNG1DOijKN9haIE5RicbEVYQ8qGIwDIFg8
-Stroboscope for android:
https://play.google.com/store/apps/details?id=com.zidsoft.flashlight&hl=en&gl=US
The stroboscope works best in a dark room.
It takes some adjustment, as each animation has different frame rates, but you will see it happen as you higher or lower it. Most work around 10-15 fps at 33rpm.
Shutter speed camera for iphone/ipad
https://itunes.apple.com/app/id1260603638?fbclid=IwAR3dDU4kvZGYxvqKq437RflR7zKxn3jNaKKyWklZWtQZ_DFHXG9VT49eqxc
or
https://www.filmicpro.com/
Filmic Pro also has an android version.
https://play.google.com/store/apps/details?id=com.filmic.filmicpro&hl=en&gl=US
Filmic pro is not free but has a lot of options and control.
The shutter speed cameras work best with lots of light.