[Gmsh] How can i save 3d cells in .msh file?

[Emanuele T.]

Hi, i'm trying to set up a 3d mesh. I prepared a .geo file. Then i try to
mesh it using Mesh module -> 3D and then save mesh (.msh) file. But when i
open this .msh there aren't any 3d cell only 2d triangle. How can i solve
this?

I attach the original .geo and the .msh meshed with Mesh->3D
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