public async void OpenShareDialog(DownloadCell cell, LRFile[] files)
        {
            CGRect cellRect = new CGRect(100, 100, 100, 100);
            if (cell != null)
            {
                // Get the cell rect and adjust it to consider scroll offset
                NSIndexPath path = _downloadsTableView.IndexPathForCell(cell);
                cellRect = _downloadsTableView.RectForRowAtIndexPath(path);
                cellRect = new CGRect(cellRect.X - _downloadsTableView.ContentOffset.X, cellRect.Y - _downloadsTableView.ContentOffset.Y, cellRect.Width, cellRect.Height);
            }
            List<NSObject> shareFiles = new List<NSObject>();

            long attachmentsSize = 0;
            foreach(LRFile file in files)
            {
                NSObject shareFile = null;
                // Handling the different Mimetypes
                // P D F  and  I M A G E
                if (file.MimeType == "application/pdf" || file.MimeType.StartsWith("image"))
                {
                    try
                    {
                        LRFileEntry entry = await ContentDb.GetLRFileEntry(file.Id.ToString());
                        if (entry != null && !String.IsNullOrEmpty(entry.LocalPath))
                        {
                            NSData data = NSFileManager.DefaultManager.Contents(entry.LocalPath);
                            if (data.Length > DataConstants.MaximumAttachmentSize || attachmentsSize + (int)data.Length > DataConstants.MaximumAttachmentSize)
                            {
                                // if file size exceeds 8mb use link share
                                shareFile = new NSString(file.URL);
                            }
                            else
                            {
                                attachmentsSize += (int) data.Length;
                                NSUrl fileUrl = NSUrl.CreateFileUrl(new string[] { entry.LocalPath });
                                var originalFileName = entry.GetFilename();
                                if (string.IsNullOrEmpty(originalFileName))
                                {
                                    shareFile = fileUrl;
                                }
                                else
                                {
                                    NSUrl tmpFolder = NSFileManager.DefaultManager.GetTemporaryDirectory();
                                    var tmpFileUrl = tmpFolder.Append(originalFileName, false);
                                    // create a temporary file with the original filename instead of id.jpg (e.g. 3242.jpg -> pump_module.jpg)
                                    NSError copyError;
                                    NSFileManager.DefaultManager.Copy(fileUrl, tmpFileUrl, out copyError);
                                    // if there was no error copying or the file already existed before copy
                                    if (copyError == null || NSFileManager.DefaultManager.FileExists(tmpFileUrl.Path))
                                    {
                                        // the file in the tmp folder has the correct filename
                                        shareFile = tmpFileUrl;
                                    }
                                    else
                                    {
                                        // on error fall back to the former name
                                        shareFile = fileUrl;

                                    }
                                }
                            }
                        }
                        else
                            shareFile = new NSString(file.URL);
                    }
                    catch (Exception ex)
                    {
                        Log.Err("DownloadsViewController.OpenShareDialog", ex, 2);
                    }
                }
                // V I D E O  and every other mimetyp
                else
                    shareFile = new NSString(file.URL);
                if (shareFile != null)
                    shareFiles.Add(shareFile);
            }

            NSObject[] activityItems = shareFiles.ToArray();
            UIActivityViewController activityViewController = new UIActivityViewController(activityItems, null);
            activityViewController.ExcludedActivityTypes = new NSString[] { };
            if (UIDevice.CurrentDevice.UserInterfaceIdiom == UIUserInterfaceIdiom.Pad)
            {
                activityViewController.PopoverPresentationController.PermittedArrowDirections = UIPopoverArrowDirection.Right;
                activityViewController.PopoverPresentationController.SourceView = cell != null ? (UIView) cell : (UIView) NavigationController.NavigationBar;
                activityViewController.PopoverPresentationController.SourceRect =
                    new CGRect(UIScreen.MainScreen.Bounds.Width - DataConstants.DownloadRightPadding - DataConstants.DownloadButtonWidth * 2 - 20, (cellRect.Height / 2), 0, 0);
            }
            PresentViewController(activityViewController, true, null);
        }