I'm trying to have the custom artwork I apply to movies purchased on iTunes (applied through the 'Get Info' pane on a Mac) spread to my iPhone or iPad. As it is these, changes appear to just be local to the machine, so I'm stuck with the default artwork for iOS devices as they appear in the TV app.

Is there any way to have the custom artwork apply to iPhone or iPad? I've tried updating iCloud Music Library to no avail.