Use the left/right page edges, arrow buttons, keyboard arrow keys, Page Up/Page Down, spacebar, or swipe on touch devices.
Computer: use Download / Save to save the complete magazine as one HTML file in Downloads or another folder. iPhone/iPad: the same button opens the native share sheet when supported; choose Save to Files. Android: it downloads to the device's Downloads folder; if the browser asks, choose where to save it.
The magazine is self-contained and portable. After it is saved, it can be reopened offline without a separate asset folder.