Hi, I want to know how i can use slack node to send message and a file to a particular channel. I am unable to authenticate
Which token type are you using? I have been using the Bot Access Token for posting to channels.
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Hey @Gauthami_Viswanathan, do you get an error? Can you please share that? 
Moreover, did you check out: Slack | Docs
I didnt get how to generate access token
You can find some detailed steps in the link @tanay posted which you can find here: Slack | Docs if you missed it.
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Were you able to follow the documentation and generate the tokens? Let us know if you still need help