Proceed through the "Add an app" flow. Once created, a page with several Graph Permissions fields should display.
Under "Platforms" add "Web"
Add a redirect URL for the Microsoft auth flow to visit once a user has confirmed authentication. Target domain if available is just 'yourdomain.com' (the deployment address) and the redirect URL is https://yourdomain.com/static/msredirect.html.
Add Microsoft Graph delegated permissions, if this option is available: Calendars.Read, Calendars.ReadWrite, Calendars.Read.Shared, Calendars.ReadWrite.Shared.
Check Allow Implicit Flow (and Restrict token issuing to this app if available).
Save the changes.
Creating the Dropbox app for Dropbox recording integration
You need a Dropbox account (If you don't already have one, you can sign up for a free account here.)