Snapping of spline points not behaving as I would expect.

[chris.riddell.art]

When I first create a 3D sketch I have the ability to make the START and END points snap to any existing sketches I have, this is great. However if I copy a sketch I don't have the ability to make the new START and END points snap to any other sketches.

A video that I have prepared here shows my issue: https://drive.google.com/file/d/1-vUs0dJJtcoEVS8HIRV_J9fmaPf79oil/view?usp=sharing

Thanks

Chris  

[TrippyLighting]

The existing curves and the construction plane you are sketching on intersect "somewhere". Fusion 360 does not automatically infer those intersection points.

You'll have to use the Sketch->Project>Intersect tool to project those points into the active sketch where the curves pierce through the plane.

Then you can snap to those points.