My blendshapes are not animating correctly inside Unity3D.
I am using Legacy Rig setup, its a custom rig made in 3DS Max.
I found this thread, but it seems this solution is for Humanoid Rig.
Please provide additional information other than your morphs aren’t working.
Did you check animations, skin, deformations & morphs in the export? I believe deformations and morph are not checked by default.
Try a simple rigged sphere with 2 simple morphs. Export and import into Unity. See if that works if all export settings are correct.
Are your export settings correct?
Did you perform a proper fbx export test back into Max to make sure they morphs are animating correctly?