Need forge help

I’m making a forge map and I need to use invisible grav lifts but when I test them they don’t do anything. This is my first forge map so there might just be something I don’t know. Pls help

When you have the launcher selected, do you see an arcing line appear? If not, you’ll have to change the settings for the launcher. If you’re trying to make an object fly, you’ll need to make sure it’s physics are set to normal.