I want the text snippets to be shown inline. I'm fine with Slack owning the image assets, because I don't have to worry about permissions the way I would if I uploaded them somewhere else (unless it was to some other internal tool).

I've been on IRC since 1993, and I'm an accomplished programmer. I still find setting up and configuring ZNC and an IRC client complicated, error-error prone, and confusing. And it doesn't always work - sometimes it quits working for no reason and I have to restart things.