Hope you are doing good.

It seems that you are trying to transfer the jar to the Putty. I would request you to refer to the below link to transfer the the file to the Remote Server:

Note : Please use the below details instead of which mentioned in the blog in Step 2:

Hostname:          ubuntu@ec2-54-185-206-73.us-west-2.compute.amazonaws.com
Username:          ubuntu
Password:           ‘Blank’ as AWS EC2 uses Key based authentication
Port Number:       22

Please try this and let us know you face any issue.

I will wait for your response.