Set up at element trigger function

Hey. I have a problem to use the at height % of page to trigger the box with my slider. It shows right away no matter if i set 10% or 90%. I use the slider revolution plugin.

Now i want to set the element trigger instead but i don’t under stand how.

I have tried to set “id” as “mailbox” at the rows and widgets. And then use #mailbox at the settings for trigger the box.

Any one know how? or a soulution to make the height trigger % work?

https://www.ads-software.com/plugins/scroll-triggered-boxes/