I've found solution for my problem and want to share it:
I did't find a plugin for Fusion 360. I also experienced problem to import .obj objects from Fusion 360 to Octane Render.
After importing mesh to Octane I always got error.
In Fusion 360, afer converting to mesh, I change in mesh body menu to Flat-Shade as you can see in attached pic. Then export to obj and import to Octane Render 1.55 without any errors.
It maybe helpful for those who have same problem as mine.
Thank you for your attention
