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The rand-guid parameter will generate a new GUID and is assigned to the Blob that gets created each time the trigger is fired.

It is mandatory to specify the Blob container name in the Path parameter of the Blob storage output binding while configuring the Blob storage output. Azure Functions creates one automatically if it doesn't exist.

You can only use Queue messages when you would like to store messages that are up to 64 KB in size. If you would like to store messages greater than 64 KB, you need to use the Azure Service Bus.