Trigger actions to use with touch screen

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!