I am absolutely interested!

Ich kann vermutlich noch nicht so viel beitragen, aber ich stolper immer mal wieder über kleine deutsche Lokalvereine zum Thema Nachhaltigkeit, die in einer englischsprachigen Community einfach keinen Platz haben, also wäre ich definitiv interessiert :)

I just tried it and it worked! Thank you so much, that was really helpful!

How do you add stairs in StreetComplete? I already had a few situations where knowing how to add stairs on an existing path while being outside would have been really useful

I’m not an expert, but if you press the layer button next to the three stripes on the top right corner, you can choose between different map layers - the second to last option has a green dot icon and is probably called something like “objects” (I’m using the German version, so I don’t know what the option is called in English). Then, after choosing a spot and pressing the plus button on the bottom left, you can add various objects like benches, trash cans, trees etc. yourself without having to leave a note for someone else to add it. But I think StreetComplete can only add little objects and metadata to already existing things, so for creating completely new streets, stairs, buildings etc. you have to use another OSM editor.