Hi! I see you're getting a black screen on the Tubi app on your iPhone running iOS 18.6. I'd love to help you get this sorted out. To start, could you please tell me a bit more about when the black screen appears? For example:
- Does it happen immediately upon opening the app or only when you try to play a video?
- Have you recently updated the app or your iOS version?
- Also, have you already tried any troubleshooting steps like restarting the app or your phone?

Once I have a better idea, I can guide you step-by-step to fix this. Meanwhile, here are some simple initial steps you can try:

1. Force close the Tubi app completely: On your iPhone, swipe up from the bottom and pause in the middle of the screen to see the app switcher. Find Tubi and swipe it up to close it.

2. Restart your iPhone: Hold the side button and volume up button (or just the side button depending on your model) until you see the power off slider. Turn it off, wait 30 seconds, then turn it back on.

3. Check for Tubi app updates: Visit the App Store, tap on your profile icon, and scroll to see if Tubi has any updates available. Keeping the app updated ensures compatibility with your device and iOS.

4. Reinstall the app if problem persists: If none of the above helps, try deleting the Tubi app and reinstalling it fresh from the App Store.

Please try these and let me know if the black screen still happens or if it appears under certain conditions. Then I can help you with more specific troubleshooting.

Are you satisfied with this initial guidance?