ESP32-S2 download BMP file from url - esp32

Question

i'm using ESP32-S2 with sd card SPI.
I'm usind SD.h library
Wifi connection
and i need to dowload a BMP form url http://example.com/test.bmp ( or in future generic binary file ) and store in SD Card.
I'm able to connect but not to save file streaming coming from url
void downloadImage(){
// Connect to external web server
Serial.println("Checking if image available");
String imageName="bottone.bmp";
String fwVersionURL = FWURL + imageName;
client.begin(fwVersionURL);
// Get file, just to check if each reachable
int resp = client.GET();
Serial.print("Response: ");
Serial.println(resp);
// If file is reachable, start downloading
if(resp == 200){
// get length of document (is -1 when Server sends no Content-Length header)
totImageLength = client.getSize();
// transfer to local variable
int len = totImageLength;
Serial.printf("FW Size: %u\n",totImageLength);
// create buffer for read
uint8_t buff[totImageLength] = { 0 };
// get tcp stream
WiFiClient * stream = client.getStreamPtr();
// read all data from server
Serial.println("Updating firmware...");
while(client.connected() && (len > 0 || len == -1)) {
// get available data size
size_t size = stream->available();
if(size) {
// read up to 128 byte
int c = stream->readBytes(buff, ((size > sizeof(buff)) ? sizeof(buff) : size));
// pass to function
}
delay(1);
}
File remoteImg = SD.open("/"+imageName, FILE_WRITE);
remoteImg.write(buff, totImageLength);
remoteImg.close();
}else{
Serial.println("Cannot download file.");
}
client.end();
}