Terrible Documentation: Morph Targets

Hello there,

I am with UE 4.6.1

I also have a problem with morph target, Actually I have done a heart, animate with morph target with 3ds max, so it’s simple morph and I don’t have any bones or skin just a simple morph target modifier with animation.
I really try to fallow the documentation, but I only get “Failed to find any bone hierarchy. Try disabling the “import as Skeletal” option to import as a rigid mesh” but If I disable “Import as Skeletal” I don’t have “Import Morph Target” anymore.

I have tested with a simple box too and I get the problem.
I am not sure to understand, do I need skeletal mesh for morph target (without any bones and skin) ?
Do I need to export first my mesh without morph and then export my mesh with the morph ?
Do I need to select when I export only the mesh with morph modifier or also the mesh that are the reference for the morph animation ?

Sorry for my question is the first time I use animation.

Thanks
Fabien