Just for others who may be struggling, I got it to work, at least in UE5.3 - I haven’t tested it in older versions.
The key is to get the Target object’s Movie Scene Binding Proxy (the object to which you want to attach the object containing the attach track). You feed this into the Get Binding ID function & it returns the Movie Scene Object Binding ID Structure that the Set Constraint Binding ID function needs. It looks like maybe the Movie Scene 3D Attach Section is a sub-class of the Movie Scene 3D Constraint Section, so it’s able to use the Set Constraint Binding ID method.
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