The Hero collection uses a big picture to present a specific metadata file to your customers.If you that specific asset is only available in a certain region your customers outside of that region won't see any Hero collection. So in order to prevent this you need to add "backup" metadata files to the Hero collection as a fallback.

The collection should have the data type “Manual”. You can then select several metadata files in the list and make sure they together cover all the regions of your service. Make sure that the sorting of the collection is set on “Default”.