Hi Suwandi,
The feature is only available for NFS protocol. However, the SFTP adapter has a similar feature.
Does the FTP server also support SFTP protocol? If yes, then you can consider switching to SFTP.
Another thing you can consider (which is also the best practice for file-based transfer) is to request that the sender application use a temporary file name when it is writing the file. Only after file is completely written, then it should rename it to the final file name. This prevents the consuming application from picking up an incomplete file.
Rgds
Eng Swee