In our iOS build logs (Unity 2018.3.3f1), I am seeing 100+ of these sorts of messages: WARNING: RGB Compressed PVRTC 4BPP UNorm format is not supported, decompressing texture WARNING: RGBA Compressed PVRTC 4BPP UNorm format is not supported, decompressing texture Especially in light of new iOS 12 memory accounting issues which we are struggling with (https://forum.unity.com/threads/ios-large-memory-usage-apparently-feature-not-a-bug.637660/), I am concerned about these warnings because they seem to indicate that textures that are marked to be PVRTC compressed are NOT being compressed. After some Google searching and Unity Docs searching, I haven't been able to find any actionable info about these sorts of error messages. Are these something to be concerned about? And if so, how do I identify the particular textures causing the warnings? What texture import settings would cause this warning? I know about "RBG(A) Compressed PVRTC 4BPP", but what is "UNorm" referring to? Any insight would be much appreciated!