FOF Slopes?

Hello, I'm trying to make slopes on a floating platform for a wad of mine, but I can't make to any. I've tried doing it the way you do it with floating platforms and adding the slope tag with the floating platform tag, but they don't work.

Is it not possible or am I missing something?

Slope the FOF's control sector by adding another sector next to it.

https://wiki.srb2.org/wiki/Slope#FOF_slopes

Not sure if you noticed or not Hedgefox, but we have a page on slopes on the SRB2 Wiki.