In the above screenshot you shared there is an option "+ Upload new app". You can use this option to upload a new app and the app gets added to the Teams Admin Centre (screenshot you shared is called Teams Admin Centre). The admin can grant permissions and setup policies from the admin centre.
Display Enterprise Application under MS Teams Apps gallery
Anonymous
Hello, we've set up an applicaton under Enterperise Applications and we are using it to access MS Teams (send messages to user's channels). We want to display this inside MS Teams Application gallery for the admins to be able to give permissions easily (e.g https://workpath.zendesk.com/hc/en-us/articles/4417869099538-Workpath-for-Microsoft-Teams) How can we add our application to the gallery?
Microsoft Teams | Development
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