GetAssetPreview not refreshing

I’m using AssetPreview.GetAssetPreview (Unity - Scripting API: AssetPreview.GetAssetPreview) and it does the job but it doesn’t refresh if I update the png’s of the GameObjects it is previewing.

Is there some command I can do to refresh the previews?

Deleting the library folder makes it have to re-generate the previews but from my experience deleting the Library folder may cause problems and obviously it takes time too. Could there be some other way?

SOLUTION: Left click reimport on the gameobjects fixes the asset previews.