(While this doesn't require rooting your device, it's incompatible with IOS, as far as I know. ) Scripts actually do work on mobile! All you need is a microSD card! Open your file manager and go to your microSD. In there should be a folder labeled "Android", open it. Then open "data", then look for the folder called "uk.co.powdertoy.tpt", open it, then the folder called "files" inside it. That is where the autorun.lua file goes and it's where you will find your screenshots, local saves folder, custom brushes folder, and scripts folder (If there isnt a scripts folder then make a new folder and name it "scripts").
(Edit: Grammar.)
you DO NOT need an SD card. t\you can find the scripts folder in the file location internal storage/Android/data/uk.co.powdertoy.tpt/files, then from there, you can access scripts folder and there should be a folder called downloaded. if you do not see it, you need to look up how to get the scripts manager. once you install the mod into the downloaded folder, go to scripts manager in the game to enable the mods (press the button labeled "lua")
edit: type into the console tpt.getscript(1, "autorun.lua", 1) in order to install the script manager
I can't access it. It can only be seen on a computer.
get an file manager from play or apple store
also sorry this dint help 1 bit sorry
the folder "uk.co.powdertoy.tpt/files" May be hidden try to enable showing hidden items in the file manager