Choose a steady, cool place
Chocolate is sensitive to heat and temperature swings. An interior pantry may work when the room stays comfortably cool. Keep bars away from windows, appliances, parked vehicles, and other places that trap heat.
Follow the storage direction on a specific product because recipes and inclusions can differ.
If refrigeration is necessary
Seal the wrapped bar inside an airtight container before chilling it. When you are ready to eat it, let the closed container return toward room temperature before opening. That helps limit condensation on the chocolate.
A changed surface is not a hidden claim
Heat or moisture can alter chocolate's appearance and texture. If packaging is damaged, food safety is uncertain, or the product seems unusual, contact the maker instead of relying on a general online rule.