Attach a video to an email using AVAssetExportSession - swift

Question

I'm rather new to programming, I apologize if my code is way off, I'm trying to use AVAssetExportSession to convert an AVAsset (video) into Data so that I can attach it to an email using MFMailComposer. I'm having a hell of a time trying to figure out this is done.
I can not figure out how to access the exported file so I don't know what to set the data to before I launch the mailComposer.
Am I close? Any help would be incredibly appreciated! THANKS.
func createVideo() {
let uiImages = self.images
let settings = CXEImagesToVideo.videoSettings(codec: AVVideoCodecH264, width: (uiImages[0].cgImage?.width)!, height: (uiImages[0].cgImage?.height)!)
let movieMaker = CXEImagesToVideo(videoSettings: settings)
movieMaker.createMovieFrom(images: uiImages) { (fileURL:URL) in
var video = AVAsset(url: fileURL)
let exportPath = NSTemporaryDirectory().appendingFormat("/video.mp4")
let exportURL = URL(fileURLWithPath: exportPath)
let exporter = AVAssetExportSession(asset: video, presetName: AVAssetExportPresetMediumQuality)
exporter!.outputFileType = AVFileTypeMPEG4
exporter?.outputURL = exportURL
exporter?.exportAsynchronously(completionHandler: {
if exporter?.status == AVAssetExportSessionStatus.completed {
if MFMailComposeViewController.canSendMail() {
let mail = MFMailComposeViewController()
mail.mailComposeDelegate = self
var subject = "Here's your GIF"
var body = "<p>Here is your GIF!!</p>"
if let emailDescription = UserDefaults.standard.object(forKey: "emailDescription") as? [String : String] {
if let theSubject = emailDescription["subject"] {
subject = theSubject
}
if let theBody = emailDescription["body"] {
body = theBody
}
}
mail.setSubject(subject)
mail.setMessageBody(body, isHTML: true)
let data = URL(fileURLWithPath: exportURL)
mail.addAttachmentData(data, mimeType: "video/mp4", fileName: "gif.mp4")
}
}
})
}
}