I already tested posting to one group and (with a slight issue with replies) it seems to work fine. Now I'm interested to know what happens if I try to post to MULTIPLE groups at the same time, what happens then?
Oh, interesting! I haven't gotten my head around Mastodon. It just seems like a huge mess, to me. Like, Twitter was a big enough mess on its own, and then Mastodon had to take Twitter and make it like 10x more complicated.