Offline downloads are a great way to show the workflow of your app on mobile. If your download isn't opening/playing, there are a few things you can do:
Check you've generated the correct download for the correct device
For example, if you've generated an APK build (for android devices) but are trying to view this on iOS, it won't work. Head back to the download section and generate a new build for iPhone
Check your iOS version is up-to-date
Offline downloads for iPhones and iPads are compatible with iOS 9 and above. Please update to the latest iOS version for your phone.
Authorise Marvel to install and run the app on your phone:
If you are seeing this message on your phone:
You need to authorise Marvel on your phone by heading to your device Settings > General > Profiles & Device Management > trust Marvel Prototyping