I am trying to edit z-enabled lines (representing hydro flowpaths) in Arc Pro. I used the Interpolate Shape tool to give my flowpaths the same z-values as my elevation surface (LAS files, in this case). I need to manually edit the elevations at culvert/bridge crossings.
I've tried creating new z-enabled line features and snapping them to my existing geometries, but I can't get the Z Mode tool (Edit > elevation group > Z Mode) to let me "bring over" the elevation values from my surface. The "Surface" option is completely grayed out in my Map and Scene views, and it only allows me to select "Constant."
How do I access the "Surface" option from the Z Mode tool? I feel like I've tried so many things, but it remains grayed out.