Hi there! I understand that when you're trying to watch movies on the Zelivonic app, it's only showing trailers and not the full movies, correct? To help you better, can you tell me if this happens with all movies or just specific ones? Also, are you using any free or trial version of the app?

Meanwhile, here are some steps we can try to fix this issue on your Windows device with WebKit:

1. Check for App Updates: Make sure the Zelivonic app is updated to the latest version, as updates often fix bugs and add new content.

2. Restart the App and Device: Close the app completely, restart your computer, and then try again.

3. Clear Cache/Temporary Data: Sometimes cached data can create playback issues. If the app has a settings menu, look for a "Clear Cache" or "Clear Data" option.

4. Check Your Internet Connection: A slow or unstable connection might cause only trailers to load, as full movies require more bandwidth. Try switching to a different network or restarting your router.

5. Sign Out and Sign Back In: If you're logged in, try signing out of your account and then logging back in.

6. Confirm Account Access: Some apps restrict full movie viewing to paid subscribers. Double-check if your account has the correct subscription or permissions to access full movies.

7. Try Sharing Trick (from Reddit user report): Some users found that tapping the “share” button, then “more,” and then tapping the movie/show portion of the screen allows full playback instead of just trailers.

If you've tried these or the issue persists, please let me know which steps you have done already. Also, if you can share any error messages or behavior you notice when trying to watch full movies, that would help me narrow down the solution!

Are you able to try these steps and update me?