Hi there! I see you're running into a "share expired" error when trying to email a scanned document from CamScanner on Windows. Let's get to the bottom of this together.

To better assist, could you tell me a bit more?
- Are you using CamScanner through a browser or the desktop app on your Windows 10 device?
- When you say "share expired," does it happen immediately upon trying to send, or after some time?
- Have you successfully emailed documents before from CamScanner on this device?

Meanwhile, here are some steps to try that generally solve “share expired” issues:

1. Check Link Validity: Sometimes CamScanner shares documents via temporary links. These links expire after a certain period (typically 24-48 hours). If you’re trying to resend an old share link, that could cause this message. When emailing the document, ensure you’re using the share function on a newly scanned or newly uploaded file.

2. Rescan or Re-upload: If your document is old or downloaded locally, try rescanning or re-uploading it to CamScanner and then share it fresh.

3. Clear Cache and Cookies: Since you’re on Windows with WebKit browsing, try clearing your browser’s cache and cookies. Corrupted data there can cause issues.

4. Update App or Browser: If you’re using the app, make sure it’s updated to the latest version. If using a browser, make sure it is fully updated.

5. Check Internet Connection: Ensure your network is stable. Interrupted uploads can sometimes cause broken shares.

6. Use Direct Export Options: Instead of using share links, try using Export or Save As PDF, then manually attach the document to your email client.

If these don’t help, let me know what you find, and we’ll dive deeper from there! Are you satisfied with these suggestions so far?