In order to start automating your documents with DocsAutomator, you have to give permissions to Google Docs and Google Drive (please make sure to give all 6 required permissions).
Depending on the data source you would like to use, you will potentially also have to give permissions for that data source as well.
You can give permissions either from the automation page or from settings in DocsAutomator.
Permissions in automation page
Permissions in settings
For your Airtable account, you have the option to limit access to certain bases or workspaces.
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