UDON Liquids - Dastmanns Portable Liquid HELP PLEASE

I’ve been using Dastmann’s system to create a pourable liquid in my vrchat world. I’ve got the pouring side working. You click the tap, liquid comes out the spout.
However I cannot for the life of me figure out how I’m supposed to get the liquid to fill a glass/cup container. I’ve tried following the way the prefabs are set up from Dastmann’s files but nothing works. The liquid will collide with the insides of the glass, but flow out as if the sides aren’t there.
I know I’m just missing something, but I can’t figure out what. Any help?