Sorry been super busy.
Some snails are relatively easy for me to ID, and some are quite tough for me at this point (I've been doing more digging into snail taxonomy and morphology, but I've got a long way to go, especially when some of the distinctions are internal, microscopic, and not necessarily contained to a single group of snails).
Unfortunately, this snail is tough for me.
Long story short, snails may or may not have 1 ) a siphon (this snail has one; siphons are used for breathing in clean water and for chemosensory purposes to find food - either prey or detritus) and 2 ) a proboscis, which is basically a trunk-like appendage for the mouth to sit at the end of (this is separate from the siphon, which sticks out through a siphonal notch or siphonal canal; I don't know if this snail has one or not, but it would be down between the eyes if it does).
Cerith snails have siphons/siphonal canals, and I know at least some species have proboscises, but I'm not sure if they all do or don't.
OP, there's no guarantee I'll be able to ID this snail at this point, but is there any chance you could get pics (top, bottom, and both sides) of the snail under white light while it's hiding in its shell? The operculum (the trapdoor the snail closes its shell with) and texture of the opening/lip around the opening may offer clues here to help us get closer to an ID here.