I think Thunkable X may be the wrong platform for this? Apple’s live wall papers work when you take a live photo. That’s my understanding anyways. Or of course you can use an app to download a live image. I’m not sure how it works on Android, despite being an android user as of this post.
Have you researched how apple’s live images work? I’ve seen the option to set a video as my background on Android so I assume common video formats work on Android. Apple may be proprietary as per.