@mastodonie @annika
In Tusky, I have always been able to quote toot (or close enough for my needs).
Tap the triple-dot on an existing toot, pick "Copy the link" from the menu.
Compose a new toot, paste the link.
I mostly use it for short, "See Also" replies. Sometimes I use it for pointing at an older toot of mine (to save typing it all in again).