Convert sub-mesh into a "single" mesh
I have a Simple particle-based prefab and I want the exchange the Question mark with my own mesh. 
However, all meshes I export from photoshop(3d icon extrusions) apparently consist of sub-meshes. leading to this error:
Particle system meshes will only work with exactly one (1) sub mesh
any idea on how to convert my mesh to get it to work with a particle system?
Thanks!
 
                 
                submesh.png 
                (100.1 kB) 
               
 
              
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              koobas.hobune.stream
koobas.hobune.stream 
                       
                
                       
			     
			 
                