How to make one curve snake along a path curve

How can I make a curve shape flow/snake along a much longer curve shape.
I thought it was: "attach curve to path", (so now the curve is animating along the path). Then "flow path" so then the curve will have a lattice around it and snake along the path.
It's not working for me. I have also increased the lattice divisions, but still the smaller curve just stays straight.

Can anyone suggest how I can do this ?

This thread has been automatically closed as it remained inactive for 12 months. If you wish to continue the discussion, please create a new thread in the appropriate forum.