TLS version

I use WinSCP on Windows 11 via batch file to access files on an AWS cloud server. Now I'm told I need to use TLS 1.2 or 1.3. Is the TLS version built into Windows, or is it built into WinSCP? How can I tell which version of TLS I'm using now?

WinSCP supports TLS up to 1.3.
It will automatically use the highest version that the server supports.
You can tell what version is actually used on Server and protocol information dialog:
https://winscp.net/eng/docs/ui_fsinfo
Or in the session log file.
You can prevent WinSCP from ever using versions below TLS 1.2 in session settings:
https://winscp.net/eng/docs/ui_login_tls

All right, I turned on the session log file and found we're using TLS 1.2, which is what we need. Thanks for the info Martin!