Trigger actions to use with touch screen

[imtoooldforthis]

I've created forms that use the simple form field action of showing a hidden field on mouse up. It works when on a desktop/device using a mouse or touch pad mouse. I realized it was not working on a touchscreen (my phone) even when using the Adobe app. After internet research, I also added the on focus trigger. It's still not working. Everthing I've found online says this should work. I also tried on blur with no luck. What am I missing? Thank you for your help! 

[PDF Automation Station · Accepted solution]

It is possible that the trigger is working but the script is not.  Many JavaScripts are not supported on mobile devices, even when using Adobe.

[imtoooldforthis]

Thank you! That makes sense to my limited understanding of how technology works.