Can't connect using SSH Key to my existing droplet from a different computer

Hi,

I want to connect to my droplet from my work computer. I created a new public key using PuTTY, and saved my private key on my desktop.

I tried to both copy the public key on my account interface here:

And log in with FileZilla using root as user and adding my private key:

But it didn’t work.

I also tried to add my new public key in the ~/.ssh/authorized_keys folder as a new line under my other public key. But again it didn’t work.

I’m sure I’m doing something wrong, but can’t guess what it is.

Thanks :)