How store servos movements in a microSD

Other Hardware Storage
2

I have simplified the program a lot and I have managed to pass the movements to the SD:

#include <ax12.h> //Incluir la librería ArbotiX DYNAMIXEL
int SERVO_ID[] = {1, 2, 3, 4}; //números ID de los motores que se están utilizando
const int servo_count = sizeof(SERVO_ID) / sizeof(*SERVO_ID);
int m = 200; //columnas -> cantidad de posiciones guardadas por cada movimiento

#include <SPI.h>
#include <SD.h>
File myFile;

void setup() {

  dxlInit(1000000); //start dynamixel library at 1mbps to communicate with the servos
  Serial.begin(9600); //start serial at 9600 for reporting data.

  for (int i = 0; i < servo_count; ++i)
  {
    Relax(SERVO_ID[i]);
    Serial.print(F("ID: "));
    Serial.println(SERVO_ID[i]);
  }
  
  Serial.print("Starting SD ...");
  if (!SD.begin(4)) {
    Serial.println("It failed to initialize");
    return;
  }
  Serial.println("successful initialization");

  
  delay(1000);
}

void loop()  {
  
 while (1) {
int positionn[servo_count][m]; //Matrix of movements

  for (int i = 0; i < m; i++) // structure to create columns
  {
    for (int j = 0; j < servo_count; j++) // structure to create columns
    {
      positionn[j][i] = dxlGetPosition(SERVO_ID[j]); //read and save the actual position
    }

    delay(10);

    for (int j = 0; j < servo_count; j++) // structure to create columns
    {
      Serial.print(positionn[j][i]); //Display the vector
      Serial.print(F(", "));

      String dataString = ""; 
      myFile = SD.open("Prueba.txt", FILE_WRITE);
      
      if (myFile) {
      myFile.print(positionn[j][i]);
      myFile.print(F(", "));

        myFile.close(); 
      }
        else {
        Serial.println("Error opening the file");
  }
    }
  }
  Serial.println(F("END!"));
 }
}

but, now, I want to integrate this part of the program in which I have taught you in the previous post.