Hi Keith,
I tried the ‘native’ solution and I couldn’t make it work for creating bi-directional relationships between CPTs.
In my project I have eight CPTs which need to be linked to each other by one-to-many and many-to-many relationships by making Relationship and Post Object fields biderectional.
The acf-post2post plugin worked perfectly out of the box.
Does the native solution work for creating two way (bidirectional) relationships between DIFFERENT post types? If so, how?