How to send a file as a message to slack channel?

Questions
1

Describe the issue/error/question

I am trying to send a message with file attachment to a slack channel.

What is the error message (if any)?

When I use the slack (upload a file) node, I get an error “ERROR: options.channelIds.join is not a function”

Please share the workflow

Share the output returned by the last node

ERROR: options.channelIds.join is not a function

2

Hi @kp-kun-dip, ideally n8n would provide you with a list of available Slack channels provided your API token has permissions to retrieve them. Can you try refreshing your list like so?

grafik
grafik662×623 28.4 KB

If fetching the list fails, could you try using an expression of {{ ["C04RYE17SQ1"] }} to specify your channel ID? It seems this node expects an array of strings behind the scenes, and this expression would provide exactly that:

grafik
grafik1227×686 43.2 KB

1 Like
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