Answer by kevork

The changes are likely not being saved because you aren't calling [EditorUtility.SetDirty][1] on the asset you want to save. If you want everything saved in the AssetBundle, use the [CollectDependencies][2] and [CompleteAssets][3] [BuildAssetBundleOptions][4]. There is an example [here][5]. [1]: http://unity3d.com/support/documentation/ScriptReference/EditorUtility.SetDirty.html [2]: http://unity3d.com/support/documentation/ScriptReference/BuildAssetBundleOptions.CollectDependencies.html [3]: http://unity3d.com/support/documentation/ScriptReference/BuildAssetBundleOptions.CompleteAssets.html [4]: http://unity3d.com/support/documentation/ScriptReference/BuildAssetBundleOptions.html [5]: http://unity3d.com/support/documentation/ScriptReference/BuildPipeline.BuildAssetBundle.html