Media Wall can only be displayed and added in the mobile app when the feature has been added on the platform via app builder.

Locate the media wall in the left sidebar menu by tapping on the three horizontal lines in the top left corner and tap on Media Wall: 

Guests will then see all approved photos/images that have been uploaded to the event Media Wall and have the option to add photos using the camera: 

Content will then be displayed in the Media Wall feature of the platform: 

Please note: Content may not appear on the Media Wall until approved by platform users. This can be changed by editing the Media Wall settings