I have noticed that auto-sleep isn’t always instantaneous on any device I’ve owned with such a cover - it can take up to 30 seconds to register. Which is good, because if you’re shifting position or briefly putting the device down, and the cover snaps closed briefly, you don’t want to have to fiddle around reopening whatever you’re doing. The cover snapping closed seems to happen more often with folio cases on smaller devices like my iPhone SE.
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