Add files via upload

Helper/VideoManager.swift

@@ -0,0 +1,41 @@
+//
+//  VideoManager.swift
+//  DispatchDemoApp
+//
+//  Created by JungpyoHong on 4/29/21.
+//
+
+import Foundation
+import PhotosUI
+
+struct VideoManager {
+    
+    func downloadVideoLinkAndCreateAsset(_ videoLink: String) {
+
+        guard let videoURL = URL(string: videoLink) else { return }
+        guard let documentsDirectoryURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first else { return }
+        if !FileManager.default.fileExists(atPath: documentsDirectoryURL.appendingPathComponent(videoURL.lastPathComponent).path) {
+            URLSession.shared.downloadTask(with: videoURL) { (location, response, error) -> Void in
+                guard let location = location else { return }
+                let destinationURL = documentsDirectoryURL.appendingPathComponent(response?.suggestedFilename ?? videoURL.lastPathComponent)
+                do {
+                    try FileManager.default.moveItem(at: location, to: destinationURL)
+                    PHPhotoLibrary.requestAuthorization({ (authorizationStatus: PHAuthorizationStatus) -> Void in
+                        if authorizationStatus == .authorized {
+                            PHPhotoLibrary.shared().performChanges({
+                                                                    PHAssetChangeRequest.creationRequestForAssetFromVideo(atFileURL: destinationURL)}) { completed, error in
+                                if completed {
+                                    print("Video asset created")
+                                } else {
+                                    print("error")
+                                }
+                            }
+                        }
+                    })
+                } catch { print(error) }
+            }.resume()
+        } else {
+            print("File already exists at destination url")
+        }
+    }
+}