How do i Make a character ragdoll in 4.18

I know the phat tools have changed, but nothing i do seems to be working. I cant check simulate physics on the skeletal mesh component in 4.18… I try doing it in a blueprint and nothing happens. Every tutorial i find is pre 4.18 so its very unhelpful. Any help would be very appreciated

Edit: I have gotten this to work on the regular third person skeleton. I cannot however get this to work on any of the skeletons from the mixamo pack. When i click simulate physics in the phat editor it works, but in game, nothing

https://i.gyazo.com/e834143e4d98cd169f7227196d3eb11c.png Set the Mesh’s collision presets to Ragdoll then it should work as before. : )

it doesnt work.