Chiming in here. I have read over this: https://theme.co/apex/forum/t/features-portfolios/98
I have done everything that this article says, but I still cannot get the filtering to show up on my site. Also, when setting up my portfolio page, not all of my portfolio categories are shown under "category select".
Another interesting note: I have both Pro and X. When I'm in X, the filter shows. When I have Pro activated, it doesn't. I'd prefer to use Pro.
Any help would be much appreciated!