With the computer it's space, inputObject.KeyCode == Enum.KeyCode.Space, but with mobile I have no clue what it's called.
I've tried other options apart from UserInputService. I've tried the humanoid.Jumping event, and the JumpRequest event of UIS, but both only work when they first jump, but not when they try to jump while in the air, which is what I need.
I also had my friend jump on mobile, open the console, and take a screenshot.
--// Example on computers:
local UIS = game:GetService("UserInputService")
UIS.InputBegan:Connect(function(inputObject, GPE)
if ((not GPE) and (inputObject.KeyCode == Enum.KeyCode.Space)) then
print("Jump Button Pressed!")
end
end)
Any help would be awesome.

3 comments
Look up ContextActionService and look through the mobile part of the control scripts.
You should make it more obvious that you want a double jump feature ;p
It's a wall jump :P