My understanding is that mastodon itself supports so-called "quote tweets," but they aren't implemented on most servers. They're implemented on the server I use, though, so this should appear to be quoted.
@pwinn ahh, my instance is still on 3.x, I'm lagging behind the times I guess
@ryanmr For example, I initially forgot to change the visibility on my reply, as I like to do, so I had to "delete and re-draft" to fix that. Unfortunately.