Cannot interact with posts unless logging in to every instance.

Hello all ✌️

I just downloaded the app and, must say, it's incredibly smooth; definitely a polished UI !

The issue is, even after having logged in (on lemmy.ml), I can't interact (upvote, comment, etc.) with content from any other instance. I get a "This thread was retrieved via inst.ance. You are not logged in there." message. Isn't the idea of the fediverse that I can interact with other instances even if I'm not registered in them? Is anyone else facing the same situation?

I have no trouble doing the same in other apps. Actually, as this community is on lemmy.world, this post had to be written using Connect.

How can this be fixed? Thanks in advance for your comments!