Updating spiffs through web updates

Hi everyone,
i successfully made a webserver than distributes firmware updates for my nodes, and I now added the function to update spiffs file as well.

All goes ok during the update, my webserver returns a filename called GlobalCloudSettings.json and the httpupdate returns ok and reboots after.

My problem is that now i can't find the file on my nodeMCU, even though debug says everything was ok.

this is the code for the update:

bool actualUpdate(bool sketch=false)
{
    String msg;
    t_httpUpdate_return ret;

    Serial.println("AUTOMATIC UPDATES: Checking for updates...");
    ESPhttpUpdate.rebootOnUpdate(false);
    if(sketch)
      ret=ESPhttpUpdate.update(updateUrl,updateUrlPort,updateUrlPath,FIRMWARE_VERSION);     // **************** This is the line that "does the business"   
    else
      ret=ESPhttpUpdate.updateSpiffs(updateSpiffsUrl,SPIFFS_VERSION);

    if(ret!=HTTP_UPDATE_NO_UPDATES)
    {
      if(ret==HTTP_UPDATE_OK)
      {
        Serial.println(F("AUTOMATIC UPDATES: Update succeeded! Device will now restart."));
        return true;
      }
      else
      {
        if(ret==HTTP_UPDATE_FAILED)
          Serial.println(F("AUTOMATIC UPDATES: Update failed!"));
      }
    }
    else
      Serial.println(F("AUTOMATIC UPDATES: No new updates were found."));  
      
  return false;
}

then after update i call this method:

void checkFile()
{
  if (SPIFFS.begin()) 
  {
    if (SPIFFS.exists("/globalCloudSettings.json")) 
    {
      Serial.println("HURRAYYYYYYYYYYYYYYYYY!!");
  }
}

code never enters in the if, meaning the file doesn't exists. I wonder how the httpupdate works, if my webserver returns a file called globalCloudSettings.json, does the httpupdate write the file in the spiffs with the same name?

you send a json file as SPIFFS update?