don't upgrade if you don't want your phone camera to be downgraded. android 14 is the best for s21u. on android 15 there is no stabilizer at 10x zoom 1080p 60 fps, not only that, on android 15 you can't change zoom while recording which can be done on android 14. and the battery is drain fast . Upgrade os but actually big downgrade .
@simbaherror8098