Gregory's Server
@mattcen IRC is my preferred. And with a fully-featured client it's barely distinguishable from these "richer" platforms.
Embedded media?
Link previews?
Edting? (s/Edting/Editing/)
Textual says hello.
Multiline paste, use a paste service. Tempted to use a paste service for your actual question?
@alice@marrow.haus textual is only available to people who can afford macbooks. All other native IRC clients suck, and I've tried them all, from irssi to hexchat