Fingerprint verification for FTP SSH transfers?

[Rogier]

I was happy to see the new SSH support in the FTP action. Works great!

One question tough about the 'Verify host fingerprint' option: when I enable it (and fill in some random numbers), it still works fine. So the check does not seem to happen?

I noticed the manual recommends to connect once, and copy the key from the build output - I tried this (the upload worked fine, using SSH2) but I didn't see any fingerprints in the output.

How do I get the fingerprint, and how do I make sure the verification works?