The last version which supports Flex was UE4 4.21. And that is an unofficial branch by community member 0lento. If you want fluid sim in 4.26 you’ll have to use simulation stages and learn how to implement a algorithm for the fluid part. Epics Asher Zhu made a video where he gives an introduction https://www.youtube.com/watch?v=-cKgZrrBJ2w
1 Like