See this question and answer from a couple of days ago:
Check it out. I cannot guarantee it is the solution but missing artwork in Mosaic has been a recurrent problem with ipads/phones since the introduction of IoS v.15.
See this question and answer from a couple of days ago:
Check it out. I cannot guarantee it is the solution but missing artwork in Mosaic has been a recurrent problem with ipads/phones since the introduction of IoS v.15.