As of the recent deprecation of CastPlayer.loaditem() , I have updated to using com.google.android.exoplayer2.MediaMetadata.

Previously, I would add artwork like this and it would appear in the system notification media item as well as the Cast Player ExpandedControlsActivity.

val movieMetadata = MediaMetadata(MediaMetadata.MEDIA_TYPE_MOVIE)
movieMetadata.addImage(WebImage(Uri.parse(posterImage)))

I am now attempting to use the functions:
movieMetadata.setArtworkUri() movieMetadata.setArtworkData()

But they do not result in the image being shown.