fix

iOSClient/Viewer/NCViewerProviderContextMenu.swift

@@ -173,6 +173,7 @@ class NCViewerProviderContextMenu: UIViewController  {
             self.videoLayer = AVPlayerLayer(player: player)
             if let videoLayer = self.videoLayer {
                 videoLayer.videoGravity = .resizeAspectFill
+                imageView.image = nil
                 imageView.frame = CGRect(x: 0, y: 0, width: newSize.width, height: newSize.height)
                 imageView.layer.addSublayer(videoLayer)
             }