add access for selected photos permission

Session/Media Viewing & Editing/ImagePickerController.swift

@@ -92,6 +92,19 @@ class ImagePickerGridController: UICollectionViewController, PhotoLibraryDelegat
         selectionPanGesture.delegate = self
         self.selectionPanGesture = selectionPanGesture
         collectionView.addGestureRecognizer(selectionPanGesture)
+        
+        if #available(iOS 14, *) {
+            if PHPhotoLibrary.authorizationStatus(for: .readWrite) == .limited {
+                let addSeletedPhotoButton = UIBarButtonItem.init(barButtonSystemItem: .add, target: self, action: #selector(addSelectedPhoto))
+                self.navigationItem.rightBarButtonItem = addSeletedPhotoButton
+            }
+        }
+    }
+    
+    @objc func addSelectedPhoto(_ sender: Any) {
+        if #available(iOS 14, *) {
+            PHPhotoLibrary.shared().presentLimitedLibraryPicker(from: self)
+        }
     }
 
     var selectionPanGesture: UIPanGestureRecognizer?