- set water mesh override like the last reply
- set collision of water on OverlapAll
Now the BP_BuoyancyExample under Engine > Plugins > Water Content > Blueprints work very well.
Move it on content folder you prefer. Edit it with your custom mesh. Edit mass end play with bouancy value, watch a tutorial on youtube.
A good trick is edit the mesh with blender 3ds or other and move it up and down to change the pivot point.
For example moove the upper zone of a barrel in the 000 cordinate of 3ds. Or move the down zone of a inflatable in 000 cordinate.
I realize a flamingo inflatable in a pool and moove the pivot of few cm change the result drastically.
Sorry for my english.