How to rename SFTP remote files?

I am in need some advices what to do when I want to rename the remote SFTP files after I downloaded them.

For example, on the SFTP server, I have 3 files: test1.txt, test2.txt and test3.txt. I got my pipeline built to download all these 3 files. After I downloaded these 3 files, I like to rename these 3 files to test1.txt.downloaded, test2.txt.downloaded and test3.txt.downloaded.

Is there a way to rename these files like that?
Thanks for your help