Thank you for reaching out to Okta Support, my name is Adrian and I'll be handling your case. If you would like to see CloudApp as a SAML application in the OIN in Okta the best route to pursue this is via a feature request. The best way to file feature requests would be from the community site. I have outlined the steps below.
To Create a Feature Requests:
Go to support.okta.com Click on "Go to Ideas" in the center of the screen where it says Submit an Idea Go to the upper right side of the screen and click on "Post Idea". Add the Title, Description and the related category and then click on "Post". Once feature requests are submitted they are visible to other Okta admins, who can vote on them to provide more visibility. Using this method will allow you to maintain visibility on your feature requests throughout the process.