Ok, is more clear now. But i cannot obtain the desidered effect. In the "Sprite Render" window there is an animation but is not reproduced correctly. Also, when i press "Loop Animation" it set frames to 180, when i choose Render FPS 20 it out put 66-67 frames; but it seems not the correct effect. The 1/3 means it cuts the 2/3 frames? Or it make only the first 66 frames?
I wanna obtain an output of 12-15 frames, from the complete effect. Is doable?