When creating a New Knowledge Base with GeneXus Next Desktop, you can select 'GeneXus Prototyping Cloud' in the Prototyping Target combo box.
Then, the Data Source combo box will be set automatically to 'Deploy To Cloud'.

Note that the Data Source can't be changed there.
PostgreSQL is used by default (for both .NET and Java) to facilitate the use of Embedding data type, which is temporarily available only for this DBMS.
To configure another Data Source, go to the Preferences window, and at the Environment level use the DataSource property to set another DBMS.

1) 'Deploy To Cloud' is not working when generating with Java.
2) In the future, it will be possible to change the Data Source in the 'New Knowledge Base' and 'New Environment' dialogs.
3) You need to set your username and password explicitly in a file called published.user.env as follows:
GX_IDP_USER_ID=your_gxaccount_username
GX_IDP_USER_PWD=your_gxaccount_password
Note: The published.user.env file is not provided in the set of files corresponding to the installation. You can make a copy from the published.user.env.template, and rename it as published.user.env. Then, replace there your_gxaccount_username and your_gxaccount_password with your current username and password.
After configuring the published.user.env file, make sure to stop and start GeneXus Next again (raise the Docker container), as explained in HowTo: Install and run GeneXus Next Desktop to apply the changes.
This way, the published.user.env file will be kept (not overwritten) when you install a GeneXus Next update.
In turn, if the credentials have not been set, an error message like the following will be displayed:
error: Invalid ReorganizeCommand Response ' /p:CloudAccessToken=d3890093-289b-4f87-adad-f2ebea826e8f!fwrgTDftyZHJlZgM38OqYIlgiHZGxnri8UQH9HAFy8C5HyHZM0IjL3QoscLiUc7nyThWNHBEoRwrb9 /p:CloudUserName=guscarr2 /p:ObjectKey=00000000-0000-0000-0000-000000000000 /p:Build=True /p:Force=False /p:Execute=False /p:SelectedOutput=Build'
error: Internal Error: Remote builder process missing.