Adding table -- data sources invisible

[alastai]

Brand new user, trying AppSheet out. Free trial account.

I copied a sample app to get started. I want to access a Google Sheet as a new table.

If I go to the little link “Free” next to my account I get a view that shows me the Google Sheet from which I originally linked to AppSheet. That is associated, apparently, with a prefabricated app. If I click that app it contains my spreadsheet as a table.

But

1. I can’t see that prefab app or my copied sample app if I click on MyApps – I get no response to that

2. If I use the pane that came up under the link “Free” to access my copied app and try to add a new table I get this

Any ideas on how to hook the Google Sheet into the copied sample? Many thanks.