AssetPostProcessor.cs

 public void OnPreprocessTexture()
 {
     if (!isAssetProcessed)
     {
         var textureImporter = assetImporter as TextureImporter;
         textureImporter.compressionQuality = 100;
         textureImporter.filterMode = FilterMode.Bilinear;
         textureImporter.maxTextureSize = 2048;
         textureImporter.textureFormat = TextureImporterFormat.AutomaticCompressed;
     }
 }
 
  public void OnPreprocessAudio()
 {
     if (isAssetProcessed)
     {
         var audioImporter = assetImporter as AudioImporter;
         audioImporter.forceToMono = false;
         audioImporter.compressionBitrate = 128000;
         audioImporter.format = AudioImporterFormat.Compressed;
         audioImporter.hardware = false;
         audioImporter.loadType = AudioImporterLoadType.DecompressOnLoad;
 
         if (assetPath.Contains("Streaming"))
             audioImporter.loadType = AudioImporterLoadType.StreamFromDisc;
     }
 }
 
  public void OnPreprocessModel()
 {
     if (!isAssetProcessed)
     {
         var modelImporter = assetImporter as ModelImporter;
         modelImporter.addCollider = false;
         modelImporter.animationCompression = ModelImporterAnimationCompression.KeyframeReduction;
         modelImporter.generateAnimations = ModelImporterGenerateAnimations.None;
         modelImporter.importAnimation = false;
         modelImporter.importMaterials = false;
         modelImporter.tangentImportMode = ModelImporterTangentSpaceMode.None;
         modelImporter.globalScale = 1f;
         modelImporter.isReadable = false;
         modelImporter.meshCompression = ModelImporterMeshCompression.Low;
         modelImporter.optimizeMesh = true;
     }
 }