To upload a file, you need to use put:
https://winscp.net/eng/docs/scriptcommand_put

On the other hand the cd and lcd should stay the same.

I am using below script to copy from Linux to windows to copy XML files and its working perfectly fine although when i want to do the same copy from Windows to linux it doesnt work.

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open sftp://username:password@linux server address -hostkey=""
option echo on
option batch on
option confirm off
option transfer binary
cd "/sasdata/prod/RCentre/HTML/"
lcd "C:\RC\Monit\HTML - Win7\"
get Cat.xml
get XML.xml
close
exit

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while copying from windows to linux, i am just changing lcd to cd and vice versa.

I used different options like get -resume or get -resumesupport. although nothing worked. Please help