Animation not rendered on mobile

I’ve been using Unity for a year or so and have built lots of animations and apps that work fine on mobiles. Now if I start a new scene, add a cube, and animate it with say, a rotation, it looks fine on the PC but doesn’t render on a mobile. Other cubes that are not animated appear OK on the mobile. If I animate the camera, nothing in the scene is rendered on the mobile, but it all looks fine on the PC, in run and as an exe.

Unity animations are preventing rendering on mobiles.

I assume I’ve accidentally changed a setting somewhere but I can’t find what it is. Can anyone help please?

Found work around