Transfering files without using temp files in VB Script

I am trying to sftp file to the destination server through VB Script written for WinSCP. I am able to send smalle files ~10 KB without any issue but when i try to send bigger file ~300 KB, the file transfered is having a .filepart extention. Is there anyway to transfer files without using the temporary filenames. I have tried the below options but nothing works.

TransferOptions.ResumeSupport = TransferResumeSupport_off

TransferOptions.ResumeSupport = off

TransferOptions.TransferResumeSupport = off

Correct syntax is:

See
https://winscp.net/eng/docs/library_com_wsh#enums
https://winscp.net/eng/docs/library_transferresumesupport
https://winscp.net/eng/docs/library_transferoptions

Thank you.