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On iOS, go to any list, tap the share icon in the top bar, and you'll see a Restore Purchase option. On Android, the purchase is automatically restored when you sign into the same Google account.
On iOS, Offsider syncs via iCloud. Make sure you're signed into the same Apple ID on both devices and that iCloud Drive is enabled in Settings → [Your Name] → iCloud.
Export is not yet available but is on the roadmap. In the meantime, list sharing allows you to give read/write access to another person.
Open the list, tap the menu (⋯), choose Manage Fields, then add, remove or reorder fields to match what you want. Changes only affect that list — other lists are untouched.