@Alex_J thank you for the reply. I checked and three.js doesn't support fbx blendshapes, which solves the future issue of compatibility. It is still puzzling how the fbx export didn't include the animation no matter where I imported it. Any help with that?
Try export same file with two different names with and without those settings and see if the size of the files is the same. If the size was different, that would indicate that the blendshapes are actually included, and thus the problem would be on whatever software you are using to view the fbx. (important that the only…