Cannot output to storage for a BlobTrigger function using dot net 7

Question

I am having an issue creating a Blobtrigger function that takes the input byte array and write it to another azure container using dot net 7 (isolated worker process). Some packages suggested by examples will not import. Blob attribute not reckonised by compiler etc. any thoughts

example

public static void Run([BlobTrigger("mycontainer/{name}", Connection = "AzureWebJobsStorage")] byte[] inputBlob,
                       [Blob("mycontainer-output/{name}", FileAccess.Write, Connection = "AzureWebJobsStorage")] Stream outputBlob)