Hi there! I understand you're having trouble uploading documents on MyChart, and it’s giving you a "network issue" error that cancels the upload. Let’s work through this together to get it resolved.

First, can you tell me if you’re using the MyChart app or accessing it through a web browser on your Windows 10 device? Also, are you connected via Wi-Fi or wired Ethernet? Any details you provide will help me tailor the steps for you.

Meanwhile, here are some general troubleshooting steps we can try to solve this network error when uploading documents:

1. Check Your Internet Connection
- Make sure your internet connection is stable. Try opening other websites or streaming a video to confirm connectivity.
- If using Wi-Fi, try switching to a wired connection or vice versa, or even try another network if available.

2. Disable VPN or Proxy
- If you’re connected through a VPN or proxy, temporarily disable it and try uploading again since these can interfere with network requests.

3. Clear Browser Cache and Cookies (if using a browser)
- Open your browser settings and clear the cache and cookies, then restart the browser and log into MyChart again.

4. Try a Different Browser or the MyChart App
- If you’re using a browser, try switching to another (e.g., Edge, Chrome, Firefox).
- Alternatively, if you’re using the MyChart app, try the web version or vice versa.

5. Check File Format and Size
- Ensure the document you are trying to upload meets MyChart’s size and format requirements. Usually, PDFs and images are accepted, but files that are too large or in unsupported formats may fail.

6. Restart Your Device
- Sometimes a simple restart can resolve temporary network glitches.

If after these steps you still face the issue, we can dig deeper by checking network settings like firewall permissions or possible server problems affecting MyChart's upload feature.

Does this sound good to start? Also, let me know if you’ve already tried any of these steps so I don’t repeat them.

Looking forward to your response!