PreloadAssets will not load in the editor.

Here is a script which will make it work in Editor also.

using UnityEditor;


[InitializeOnLoad]
public class TouchPreloadedAssets
{
    static TouchPreloadedAssets()
    {
        GetPreloadedAssets();
    }

    private static UnityEngine.Object[] GetPreloadedAssets()
    {
#if UNITY_2018_2_OR_NEWER
        return PlayerSettings.GetPreloadedAssets();
#else
            var findProperty = typeof(PlayerSettings).GetMethod("FindProperty",
                BindingFlags.NonPublic | BindingFlags.Static);
            var preloadedAssetsProp = findProperty.Invoke(null,
                new object[] { "preloadedAssets" }) as SerializedProperty;
            var assets = new UnityEngine.Object[preloadedAssetsProp.arraySize];
            for (int i = assets.Length; --i >= 0;)
            {
                var assetProp = preloadedAssetsProp.GetArrayElementAtIndex(i);
                // Property access forces Unity Editor to load asset
                assets[i] = assetProp.objectReferenceValue;
            }
            return assets;
#endif
    }
}
```

PreloadAssets will not load in the editor.

Here is a script which will make it work in Editor also.

using UnityEditor;


[InitializeOnLoad]
public class TouchPreloadedAssets
{
    static TouchPreloadedAssets()
    {
        GetPreloadedAssets();
    }

    private static UnityEngine.Object[] GetPreloadedAssets()
    {
#if UNITY_2018_2_OR_NEWER
        return PlayerSettings.GetPreloadedAssets();
#else
        var findProperty = typeof(PlayerSettings).GetMethod("FindProperty",
                BindingFlags.NonPublic | BindingFlags.Static);
        var preloadedAssetsProp = findProperty.Invoke(null,
                new object[] { "preloadedAssets" }) as SerializedProperty;
        var assets = new UnityEngine.Object[preloadedAssetsProp.arraySize];
        for (int i = assets.Length; --i >= 0;)
        {
            var assetProp = preloadedAssetsProp.GetArrayElementAtIndex(i);
            // Property access forces Unity Editor to load asset
            assets[i] = assetProp.objectReferenceValue;
        }
        return assets;
#endif
    }
}