FlowAlongSrf Not flowing the way it should be

Hey there, I’m having trouble getting an object to flow along the surface in the way i want. It is working on the first half of the object but then straightens out away from the curved surface after that. Not sure what I’m doing wrong.

Please advise! file attached

Hello- try this -
Explode the target object and MergeSrf > Smooth=No the three surfaces;
MergeAllCoplanarFaces the flat base object into one surface.

Anyt luck?

The issue is, the command works from one base surface to another - what you have in your file is a polysurface at each end of the operation, so the flow was using one face from the base polysurface and one face from the target, not all three.