Apex only supports 4 bones per weight
Due to hardware limitations, Apex only supports up to 4 bone skinning influences per vertex for its cloth deformation. If more than 4 influences are used in your model, you usually get the following warning message when creating a Apex Cloth within the PhysX plugin:
// Warning: Some vertex use 6 bones for weight (|pPlane1|pPlaneShape1). PhysX only supports 4 at most.
Notice that, this warning does not prevent to save the apx file and use it within Golaem but keep in mind it will only recall the 4 biggest weighting influences when cloth simulation will be computed. This does not affect the vertices which are not cloth simulated.