Uploading a file

I am trying to upload a file to a remote server. Using winscp I can drag it across just fine. I have a public key stored there. When I try to use a script it wants a password enered. Before I enter my password it closes. I use "winscp.com /script=SFTPTVE.txt" on the command line, the put command is in the txt file. How do I get this to go? Actually I have
"option batch abort
option confirm off
open sftp://kpu010@scp.sssnet.com/
put tve-export.tab /home/kpu010/
exit"
in the txt file.

You can specify your private key using -privatekey= switch of open command:
https://winscp.net/eng/docs/scriptcommand_open

My script now contains
"option batch abort
option confirm off
open sftp://kpu010@scp.sssnet.com/ -privatekey=rsa_keypr.ppk
put tve-export.tab /home/kpu010/
exit"
In order to use the command line Winscp said I had to use keys converted by PuTTYGen.
I did this and when I run the command now I get "Server refused our key" and promts for a password.
Any suggestions?

Did you registered public part of the key on the server?
Are you able to authenticate using GUI with the key?