Actually tried embedding first, that triggered an error, then tried something else and it just put the link in, then I "shared to twitter", copied it and pasted in a toot -- that worked, so posted it, but then I'd forgotten the hashtag and had to "delete and re-draft" - another fine feature of CoSo.

I really like them to play "en-toot" in my CoSoMusic pinned column. Keeps the tab number down.