Help needed for the setup

[desoter]

Hi, I'm trying to setup this great tool to transfer backups from a VPS to google drive.

During the initial setup when following the url given for "Visit the below URL, tap on allow and then enter the code obtained" I see the page from google that the app [name_given_by_me] is trying to access, I choose the correct google account but then I receive an error:
Errore 403: access_denied - The developer hasn’t given you access to this app. It’s currently being tested and it hasn’t been verified by Google. If you think you should have access, contact the developer

I'm not sure what permission I should add and where. The steps in the guide to enable the API and create the credentials are successfully done.

Any idea?

Thank you very much!

[desoter]

Shortly after I wrote, I found what was needed.
In the same page of the credentials, just below the credentials menu voice, there is OAuth consent screen (roughly translated from the italian "Schermata consenso OAuth"). In that section I had to choose whether to make Public the application or add a test user. For now I set my own gmail address as test user and it worked. I'll try to figure out if I didn't understand some of the initalial decisions/steps in the setup.
Cheers.