Exporting files with no sound

I’m on Windows 10 and while I can now record after locating device change needed and it appears I can export file, there’s nothing in the playback. I have the latest version of Audacity, which I understand now includes Lame. Please let me know what I need to do to fix this situation. Thanks.

If you are recording with a USB device, the problem may be this:
Why have I lost sound after connecting a USB device on Windows?