Facebook is now adding post creation to its Creator Studio App – a mobile compliment app. Before, one can only create a post on a Facebook Page and publish it using a desktop. After publishing, that’s the time one can use the mobile app to check insights. By adding post creation, creators can now create and publish content using the app on a mobile device.

Also, Facebook added the metadata fields and thumbnail selection to video content. Users can add a title and description of the video on metadata. They can select thumbnails from a device library or already uploaded videos.
The rollout applies to both Android and iOS starting 21 May 2020.
Implications for Marketers:
Post creation makes it easy for marketers to manage many Facebook Pages. They can now update content anytime and anywhere. They’ll also be able to read and respond to comments in real-time. As such, marketers can manage marketing initiatives more effectively.
Reference: https://www.facebook.com/facebookmedia/blog/post-creation-now-available-on-creator-studio-app