Save() to export pictures

[humano]

Hi there! I am trying to save the picture that my sketch has done but I can not do it. I use save() but when I go to the folder of my sketch in my android phone I don’t find it. Can you please help me?

void setup() {
  
  size(1000, 1000);
  background(255,255,255);
  
  float x1 = random(0, 1000);
  float y1 = (0);
  float x2 = random(0, 1000);
  float y2 = random(0, 1000); 
  float x3 = random(0, 1000);
  float y3 = random(0, 1000);
  float x4 = random(0, 1000);
  float y4 = random(0, 1000);
  float x5 = (1200);
  float y5 = random(0, 1000);
  float x6 = (1200);
  float y6 = random(0, 1000);  
  float x7 = random(0, 1000);
  float y7 = (1200);
  float x8 = random(0, 1000);
  float y8 = random(0, 1000);
  float x9 = random(0, 1000);
  float y9 = random(0, 1000);
  float x10 = (0);
  float y10 = random(0, 1000);
  float x11 = random(0, 1000);
  float y11 = random(0, 1000);
  float x12 = (0);
  float y12 = random(0, 1000);
  float x13 = random(0, 1000);
  float y13 = (0);
 
  
  stroke(0, 0, 0);
  strokeWeight(3);
  
  //a
  line(x1, y1, x2, y2);
  line(x2, y2, x3, y3);
  line(x3, y3, x4, y4);
  
  //b
  line(x4, y4, x5, y5); 
  line(x5, y5, x6, y6);
  line(x6, y6, x7, y7);
  
  //c
  line(x7, y7, x8, y8);
  line(x8, y8, x9, y9);
  line(x9, y9, x10, y10);
  
  //d
  line(x10, y10, x11, y11);
  line(x11, y11, x12, y12);
  line(x12, y12, x13, y13);
  
  save("numberone.tiff");
  
  }