Hi! I understand your Lib app is not playing audiobooks on your iPhone running iOS 17.6.1. Let’s work through this together to get your audiobooks playing again.

First, a few quick questions to narrow down the issue:
- Are you having trouble with all audiobooks or just specific ones?
- Are you streaming them or trying to play downloaded files offline?
- Do you see any error messages when trying to play?
- Have you tried closing the app and restarting your iPhone yet?

While you check on this, here’s a step-by-step approach to try:

1. Close the Lib app completely: Swipe up from the bottom and hold to open app switcher, then swipe the Lib app off the screen.
2. Restart your iPhone: Press and hold the side button with volume button, slide to power off, then turn it back on.
3. Check your internet connection: Make sure you’re connected to Wi-Fi or have good cellular data.
4. Check for app update: Go to the App Store, tap your profile icon, and see if Lib has an update available—install it if yes.
5. Remove and re-add library cards in Lib: In the app, remove your library card(s) and then add them again to refresh your account.
6. Make sure device volume is up and silent mode is off. Check Control Center and physical mute switch.
7. Try playing a different audiobook (streamed or downloaded) to check if it's a file issue or app-wide.
8. Clear space on your iPhone if storage is low—go to Settings > General > iPhone Storage.

If none of these help, the next step would be to uninstall the Lib app and reinstall it from the App Store, then log back into your library. This often resolves app glitches.

Please try these and let me know what happens or if you've already tried any of these steps! That way I can suggest the best next move.