Moving vertices deletes Z values

[Kevin_Andras]

According to this:

https://pro.arcgis.com/en/pro-app/latest/help/editing/modify-feature-vertices.htm

"When you move a vertex, consider the following:

• In map views, dragging a z-aware vertex preserves its z-value."

I am editing polyline vertices so their endpoints are coincident with polygon vertices.   Every time I move a vertex to a vertex location on a polygon,  its Z value gets set to zero.  The polygon Z values are zero - I was planning to update the Z values later on.  If I try to move the polygon vertex to a polyline endpoint, I get an error saying "the coordinates or measures are out of bounds".    

I updated the polygon vertex Z values so they are not zero, and now when I move a polyline vertex to be coincident, its Z values gets change to the polygon's Z value, which is NOT what I want.  

How can I move polyline vertices without the Z values being changed?  

[DuncanHornby · Accepted solution]

You need to change a snapping property to stop it taking on the polygon Z value. Here is my test scenario.

If I snap it without changing the setting it takes on the Z value of the vertex in the polygon, the problem you are experiencing.

You need to go to settings and UNTICK Z Snap

With that unchecked you get the correct result.

[Kevin_Andras]

Aha!  Thank you so much!!!!