Adding Apps to the Apps menu

I have added in the keys for the API that I am wanting to use at the top of the automation, but I can’t figure out how to add a new app into the Sandbox.
Is this possible?

I am needing to be able to see the app I am trying to connect in the sandbox so that I can ensure I am building the remaining flow correctly.

To create a new app, it is easiest to copy an existing one that uses the same authentication.

For OAuth, you can start by making a copy of the Keap app assembly:

If the API uses an API key instead of OAuth, you can copy ActiveCampaign’s assembly:

When you save the copy, the catalog entry information is then entered: