It looks like Samsung's aware of how badly-positioned the fingerprint scanner is on the recently-announced Galaxy S8 and Galaxy S8+, as it's programmed a reminder into the camera application reminding you to clean the camera lens.
A clean lens makes for better shots. Clean your camera lens to keep taking better pictures.
Granted, the pop-up alert doesn't explicitly say anything about the fingerprint sensor — but it's clear that's what it's about. After all, it'll only appear when you activate fingerprint authentication and register at least one fingerprint.
Read more: Here are more details regarding the Galaxy S8′s camera sensors
We should probably note, however, that you won't see the alert every time you use the camera. It'll strut its stuff the first time, then (fortunately) every once in a while after that.
