Audio Playback can't play in the students' homework

Dear Live Worksheet Team,
    It's the first time I use the mp3 player feature in my worksheet. I like it. Unfortunately, my students can't listen to some of the audio file, eventhough I can listen to all of the audio file in my live worksheet template.
    I attach the video recording for you to analyze what's going on. I'm looking forward to your quick response and can fix the problem ASAP.

You can copy paste the video link below, since the attachment here in only for image
https://drive.google.com/file/d/1zQ3AmMbQI8ogMEdE…

Thank you for your attention,
Tere