Post to Slack using oath, allows for local file upload
This script results in two posts to Slack. The first is a direct image upload from a folder local to the script. The second is some text and an image crafted using https://api.slack.com/tools/block-kit-builder.
The output is as follows:
Both images sourced from https://ccsearch.creativecommons.org/search?q=slack&provider&li<=commercial&searchBy