func addAssetID(_ assetIdentifier: String, toImage imageURL: URL, saveTo destinationURL: URL) -> URL? {
let kFigAppleMakerNote_AssetIdentifier = "17"
let image = UIImage(contentsOfFile: imageURL.path)
let imageRef = image?.cgImage
let imageMetadata = [kCGImagePropertyMakerAppleDictionary: [kFigAppleMakerNote_AssetIdentifier: assetIdentifier]]
let cfUrl = destinationURL as CFURL
let dest = CGImageDestinationCreateWithURL(cfUrl, kUTTypeJPEG, 1, nil)
CGImageDestinationAddImage(dest!, imageRef!, imageMetadata as CFDictionary)
_ = CGImageDestinationFinalize(dest!)
return destinationURL
}