I have been posting to a community on lemmy.fmhy.ml for a while now. Someone notified me that since it's down no one else will see my posts. I assume that only people on my instance can see them. Connect app won't let me post there but doesn't tell me why, and I've asked about that in its community. The web page lets me post there but doesn't tell me that the instance is gone. I would never have known if someone didn't tell me. How am I supposed to know this?

Edit - it was Imaginarymechas@lemmy.fmhy.ml
Edit2 - I think if you're on the same instance as me, lemm.ee, then you can see my stuff but no one else can.