The submit section is a real link between you and your users. You may need to get different types of content from your audience and here are some examples of how to use it.

A submit section for a employee communication app

Dali Corp uses its app to improve internal company communication and foster bonding between employees. The management decided to provide a kind of complaints/ideas box in the app in order to create a zone of expression for its employees. They will be able to use it to share their feelings and recommendations with the management at any time.
The content received won’t be made public by the management, but only analyzed to improve the working conditions of the employees.