This action uploads file(s) to slack using v2 files API.

Required Slack app token. See Internal app tokens

1. Create app
2. Add files:write and files:read permission
3. Install app to your workspase
4. Invite bot to required channels /invite <botname>
5. Use bot token from OAuth & Permissions page

Required List of files including file path and filename remember json wont work with backslashes so you might need ${{ toJSON(variable) }}

Slack channel ID for upload THIS IS NOT A CHANNEL NAME you can easily check for channel ID in the browser URL after navigating to channel there

Slack thread for upload

The message text introducing the file in specified channels.

on: [push]

jobs:
  slack_upload_job:
    runs-on: ubuntu-latest
    name: Upload test file
    steps:
      - name: Checkout
        uses: actions/checkout@v4
      - run: |
          mkdir dir
          echo "Test file " > dir/test.txt
      - name: Upload to slack step
        uses: vaporif/slack-file-upload-action@v1
        with:
          token: ${{ secrets.SLACK_TOKEN }}
          files: >
            [
              {"file": "./dir/test.txt", "filename": "testfile.txt"},
              {"file": "./dir/test.txt", "filename": "testfile.txt"}
            ]
          channel_id: C06S5FLDSN4