+1 for Dropbox Paper. I am weirdly addicted to it for all my internal documentation and writeups. When you get used to (and expect) the guardrails, it's so fast to quick create a doc with multi-media.
My only pain point is the damn file system
My only pain point is the damn file system
That, and the fact that new files are world-readable by default. (With unguessable URLs, but still...)