[Daydream] ATC export results in unknown textures

I followed the instructions from: http://docs.unrealengine.com/latest/INT/Platforms/GoogleVR/QuickStart/index.html
and when I export with ATC selected I get the following log messages when starting the app:

06-05 14:15:09.595: D/UE4(11959): [2016.06.05-12.15.09:602][-6918240]LogTexture:Error: Texture2D /Game/StarterContent/Textures/T_Explosion_SubUV.T_Explosion_SubUV is unknown which is not supported.

(just one texture message pasted here - however approx 90% of my textures get this), which results in missing textures in the game.

Is there some texture compression setting that is not supported for ATC ? Is ATC required for Daydream and what is the advantage of it?


When exporting at ETC2 the error is
not shown and all textures are seen.

EDIT: Also occurs in 4.13

As per the answers given here: Google Daydream - XR Development - Unreal Engine Forums
ASTC or ETC2 should be used since ATC is not supported by the Exynos chipset

Yes, ATC is not showing textures for Cardboard plugin at least in the Galaxy S7, confirmed, works with ETC2, thank you.