Unable to answer "What’s the surface here?" – Steps – https://osm.org/way/1237615838 via StreetComplete 63.0:

Solid slabs of stone used, not sett and not paving stones as I understand the osm definition. What surface type should this be tagged?

Attached photo(s):
https://streetcomplete.app/p/338513.jpg
https://streetcomplete.app/p/338514.jpg