AzureStorage.Blob.create_container

You're seeing just the function create_container, go back to AzureStorage.Blob module for more information.
Link to this function

create_container(context, container)

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Specs

create_container(AzureStorage.Request.Context.t(), String.t()) ::
  {:ok, String.t()} | {:error, String.t()}

The Create Container operation creates a new container under the specified account.

If the container with the same name already exists, the operation fails.