Hi there! I understand you're having trouble with highlighting in the JW Library app on your Android 10 device using WebKit—specifically, when you try to highlight, it ends up turning the page unintentionally, and you’re also unable to back up your highlights. Let’s work through this together.

To start, may I ask:
- Is this issue happening in a specific publication or across all material you try to highlight?
- Have you noticed whether this problem started after a recent app update or change?

Meanwhile, here are some steps we can try to resolve the highlighting and backup issues:

1. Check for App Updates
Sometimes, issues like this are fixed in newer versions of the app. Please go to the Google Play Store, look for JW Library, and see if an update is available. If yes, install it and then test highlighting again.

2. Adjust Your Touch Sensitivity & Gesture Handling
Since highlighting requires precise touch input, sometimes the app misinterprets a swipe or tap. Try the following:
- When highlighting, tap and hold gently on the text rather than swiping quickly.
- Try zooming in on the text to make selection easier.
- Avoid swiping left/right to prevent unintended page turns while highlighting.

3. Clear the App Cache
Cached data sometimes causes odd behavior. To clear your JW Library app cache:
- Go to your device Settings > Apps > JW Library
- Select “Storage” then “Clear Cache” (not “Clear Data”)
- Restart the app and test highlighting again.

4. Backup Highlights Correctly
For backing up notes and highlights in JW Library:
- Open JW Library, tap the Settings icon.
- Select “Backup.”
- Make sure you save the backup file to a secure location like Google Drive or internal storage.
- If you try to restore, be aware it replaces your current highlights—it doesn't merge them.

If after these steps the page still turns on you while highlighting or backup still fails, there might be a deeper software conflict or bug. In that case, uninstalling and reinstalling the app (after backing up your data) can help refresh everything.

Please give these steps a try, and let me know if anything changes or if you experience any difficulty during the process. I’m here to help until this is resolved! Are you satisfied with this approach so far?