file not saving to FTP server

this is my save method to save a file to ftp server

public SFile save(SFile sFile) {        try {            this.createDirectories(sFile);            String remote = "/home/ftp-user/documents/abc1234/Test.pdf";            ftpClient.storeFile(remote, sFile.getInputStreamFile());            return sFile;        } catch (Exception e) {            log.info("ftp save error = {}", e.getMessage());            return sFile;        }    }

the createDirectories function created the sub folder successfully. (checked using filezilla)e.g /home/ftp-user/documents/abc1234but the storeFile() doesn't store the file in the server. no exception is thrown either.