I don’t think it was ever possible for OBJ files to be downloaded on Elements. If they were available it would have been quite a few years ago.
The 3D section on Elements uses the PixelSquid service which has only ever been PNGs and PSDs, as it’s entire purpose is to be directly connected with Photoshop and allow users to choose the angle of whichever object they want and have it placed as a layer within Photoshop.
The only way for you to animate them would be to download every angle you need separately, then animate it as a 2D image then replace it with one of the other angles as you go. I could be wrong, but you probably wouldn’t be able to get anything smooth and realistic looking.
You can still get OBJ files from https://3docean.net/