Store leftover flatbread at room temperature in an airtight container for 2-3 days. For longer storage, keep them in the freezer in a freezer bag for up to 3 months. Use wax paper or foil wrap between the breads to prevent sticking. Let the bread thaw in the refrigerator and reheat in the toaster, or in the oven or air fryer at 350ºF for 5 minutes.