When you want to create a new blob in your code Azure Functions

[FunctionName("MyTestFuncion")] [StorageAccount("StorageConnectionAppSetting")] public static async Task Run([EventHubTrigger("myeh", Connection = "EHConnection")] EventData[] events, Binder binder, ILogger log) ... using (var writer = await binder.BindAsync<TextWriter>( new BlobAttribute("<container>/{rand-guid}.json"))) { writer.Write(<what you want to write>); }