Why my live test in ios, not Live ? How can i refresh for Live test?

For me (I have a Samsung Galaxy A13 and use my google account), it changes live while I edit it, but when my phone screen turns off (or if I exit the Live app, but keep it open in the background while I use another app), and then I turn it back on, it no longer changes live when I edit. I have to close my Live app, and then re-open it, and then it changes live when I edit it, but if my phone’s screen turns off (or if I leave it in the background), then it happens again! Any explanation? (It might be on my end, but I’m not 100% sure)