unable to access database/create a datamodel in appian community

Hi Team

Iam working in appain community edition and trying to create a record type and facing the following problems like

1 .not getting start from scratch option while creating record type

2. when selecting database option it shows error : data source cannot be reached

3. CDT/Data store is not accessible in this environment

4.unable to see cloud database in navigation bar

could you please suggest the recommened approach.

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