Is it impossible to execute an Azure function triggered by a blob in the portal?

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No, it is not impossible to execute an Azure function triggered by a blob in the portal. In fact, triggering an Azure function from a blob is a built-in feature of the Azure Functions platform. To set up an Azure function triggered by a blob, you can use the Azure Portal to create a new Azure Function and configure the Blob trigger. Once the trigger is configured, the function will automatically execute whenever a new blob is created or updated in the specified blob container.