Server working but directory always empty

Hi, I have an ESP32 application which logs to a LittleFS root. Each time the log file is updated I send a directory listing to the serial port and I can see the file under "/" and its size, which has increased. When I connect to the FTP server and "dir" or "ls" I get:

227 Entering Passive Mode (192,168,XXXXXXXXXX)
150 Accepted data connection to port 50009
226 0 matches total

"pwd" shows that I am indeed in "/" Any ideas?