Uploading a file to a Slack channel

This workflow shows you how to post a message to a Slack channel and add a file attachment. It also shows you the general pattern for working with Binary data in n8n (any file like a PDF, Image etc).

Specifically, this workflow shows how to download a file from a URL into your workflow, and then upload it to Slack.

Video walkthrough Watch this 3 min Loom video for a walkthrough and more context on this general pattern:

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Author:Max Tkacz(View Original →)
Created:8/14/2025
Updated:11/17/2025

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