问题
I am trying out the Slack's API using the incoming webhook feature, posting messages works flawlessly, but it doesn't seem to allow any file attachments.
Looking through I understand I have to use a completely different OAuth based API, but creating more tokens just for the purpose of uploading a file seems odd when posting messages works well, is there no way to upload files to slack with the incoming webook?
回答1:
No, its is not possible to upload files through an incoming Webhook. But you can attach image URLs to your attachments with the image_url tag.
To upload files you need to use the Slack Web API and the files.upload method. Yes, it requires a different authentication, but its not that complicated if you just use a test token for all API calls.
来源：https://stackoverflow.com/questions/35742775/is-it-possible-to-post-files-to-slack-using-the-incoming-webhook