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Editor Won't Let Me Save My Main Level

I was moving my assets around into new folders, trying to organize them better. I tried to save my main map, and I get this error message:

Warning Can't save G:/C Drive backup/Unreal Projects/SMash 4.12/Content/RollingBP/Maps/ROll.umap: Graph is linked to external private object Texture2D /Game/ROll.Texture2D_130 (MobileWeightNormalmapTexture)

I have no idea what this means. Please share your expertise!

Product Version: UE 4.12
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asked Jul 08 '16 at 04:40 PM in Using UE4

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Im A Hefty Lad
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Here's how I solve it: Settings -> Preview Rendering Level -> Mobile/HTML5 -> iOS ES2 Preview Then I can save it.

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answered Dec 15 '16 at 07:07 AM

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