Why am I able to login to my server via filezilla, even though I didn't enter a password?

Hey guys, I’m a new user, so I may be missing something obvious… I’m running windows and a DO ubuntu server. I created a key with puttygen, created a DO server with that key, then accessed the server with putty with my key.

Now here’s where I’m confused. I opened up filezilla, entered in my server ip for the host, and root for the user, and left the password blank… and I got in. Why is this? I tried logging into the server again via a ftp client on my android, same ip, same user, no password, but couldn’t get in.

So did my server relate my computer with my key, allowing me to access my server without a password, as long as it recognizes my computer?

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if you use pass set te port 22 make shur this not good you can do evrey think via terminal better

Sorry, I’m not understanding. I didn’t enter my ssh key on filezilla.

It isn’t relating your computer with the key, it’s using the key to authorize you. So no matter what device you’re on, including your phone, if you use that same key to authenticate, you will be logged in.