Importing server public key into FileZilla (or other sftp clients)

Question

How to import server public key into FileZilla?

I'm able to access my server from SSH, and have the privilege to view whatever that's in /etc/ssh. I can produce hash fingerprints for these public keys.

But is there a button in FileZilla that actually allow me to import those server authentication credentials? Or do I have to do "Trust-On-First-Use" for my server?

To avoid certain type of XY problem:

Due to 2019-nCoV, some of our collegues had to work at home, so I'm writing a guide for them to download necessary files. I chosed FileZilla because it's cross platform. WinSCP seems to be able to import those public keys, but it's Windows-specific.

Answer 1

FileZilla does not have such function.

You would have to import the keys manually into the cache. FileZilla uses a customized version of PuTTY psftp under the hood. So it uses PuTTY host key cache. On Windows it's in Windows Registry under HKCU\Software\SimonTatham\PuTTY\SshHostKeys. Actually WinSCP can export the host key to PuTTY (and FileZilla) cache. But that won't help you with other OSes.