Only the published content is shown in the app. Please make sure that:
The content card is published
The Mix in which the content card is created is also published.
If both the Mix and the content card is published, please make sure that the Mix is not marked as ‘NOT in News Feed’. To know more about how to display/hide a Mix in News feed, check here: How can I hide a Mix from the Main Newsfeed of the App?
Please feel free to write to us at firstname.lastname@example.org if the problem is not resolved