Google Workflow - error 404 "the specified bucket does not exist."

[BruceM06]

I am trying to implement a simple Google Workflow that will grab a PDF from an existing bucket, call an LLM via an API and output a summary of the document. However, the Workflow gets stopped at the getDocument stage because it cannot find the bucket, even though I am certain I have created it and input the right information. I have tried to consult the internet, but haven't had any success.

I am quite new at this, so sorry if this is super basic.

Below is the YAML of the workflow:

main:

  params: [args]

  steps:

    - init:

        assign:

            - project: "predict-able"

            - location: "us-central1"

            - model: "text-bison"

            - method: "predict"

            - llm_api_endpoint: ${"https://" + location + "-aiplatform.googleapis.com" + "/v1/projects/" + project + "/locations/" + location + "/publishers/google/models/" + model + ":" + method}

            - sumoutputs: {}

    - getDocument:

        call: googleapis.storage.v1.objects.get

        args:

            bucket: args.bucket

            object: args.object

            alt: "media"

        result: documentContent

    - ask_llm:

        call: http.post

        args:

            url: ${llm_api_endpoint}

            auth:

                type: OAuth2

            body:

                    instances:

                        -prompt: '${"Summarize the following document" + documentContent.data}'

                    parameters:

                        temperature: 0.1

                        maxOutputTokens: 2048

                        topP: 0.1

                        topK: 40

        result: llm_response

my inputs are: {"bucket": "testbuckety", "object": "testbuckety/WorkdayFY24"}