-set Octane as renderer
-in tyFlow001, Interfaces: Enable Particle Interface

Optionnaly, to see the color change on arrow/actor collision:
-create a multi material with 3 materials
-assign this multimaterial to tyFlow001

and add 'Material ID' with tyFlow editor, before 'Mesh' : 
 in 'actor_body_kinematic'(set ID 1)
 in 'actor_body_dynamic' (set ID 2)
 in 'arrows' (set ID 3)
 
 