A common bug in the Slack desktop app causes downloads to fail if the default folder is no longer accessible or has permission issues.
: Open Settings > Apps > Slack > Storage & cache > Clear cache . unable to download files in slack
: Use Ctrl+R (Windows) or Cmd+R (Mac) to refresh the Slack app. A common bug in the Slack desktop app
Choose a new folder (e.g., your Desktop or a different internal drive). unable to download files in slack
Try downloading the file again. Many users find that switching the location and then switching it back fixes the "stuck" status bar.