Event clips only saved at 320p on iOS devices

I have Wyze cam plus subscription. I can watch event clips saved on cloud with no problem. But when I tried to save the event clips to my iPhone or iPad, I found the downloaded clips were only saved at 568x320 resolution instead of 1080p. Today I tried to do the same on an android phone, surprisingly, it did saved at 1080p. Did I miss anything on my iPhone and iPad? Thanks!