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:

Help me set up the n8n workflow "Uploading a file to a Slack channel" (https://n8n.io/workflows/1570). It uses: HTTP Request, Slack. Import the template JSON into my n8n instance, list every credential I need to create, and walk me through testing it.