I noticed, that in browser view of shared folders the expiration date is not dispayed even if set. It is using the corresponding App. I checked different browsers: Safari, Firefox (133.2), Chrome (131.0.6778.103) with the very same result on each.
iOS Version: 16.7.10
If you use Nextcloud 28.0.13 or 30.0.3 this is a known bug.