How to processing undetermined amount of attachment (from Outlook trigger)

Questions
1

Describe the problem/error/question

I’m writing a workflow to fetch pdf attachment from emails on my outlook account, and upload to my Paperless-NGX. Those emails might contains multiple files, and only a few of them might be pdf.

Now the binary output from the outlook trigger is essentially an object with multiple attachment_ prefix. I can use the these field name in the HTTP request node.

The question is, how can I specify the Input Data Field Name to reflects the binary file I want to upload via HTTP request? Given that I only want one with pdf types which can be in any where inside the list of binary output.

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What is the error message (if any)?

Please share your workflow

Share the output returned by the last node

Information on your n8n setup

  • n8n version: 1.100.1
  • Database (default: SQLite): Postgres
  • n8n EXECUTIONS_PROCESS setting (default: own, main):
  • Running n8n via (Docker, npm, n8n cloud, desktop app): Docker
  • Operating system: Ubuntu Server 24.04
2

Hey @wutipong hope all is well, welcome to the community.

You can put a code node in front of the http request node, which would process all binaries, filter out anything that isn’t mime type application/pdf and send only what you need down the flow path.

3

Thank you, @jabbson. You gave me an idea. Now I add a code node which return keys using Object.keys($binary).

So the current flow is like

I’m going to move the filtering inside the code node as per your suggestion later, but for now this seems to work to me.

Thanks a lot!