You can easily publish videos to Mux with AVflow.io.
To get started, you need a Mux account and to know your Mux Access Token and Secret Keys. Assuming you have a Mux account, here's where you find the token/keys:
Go to: https://dashboard.mux.com/
2. Select "Create API access token" and click "Generate Token"
3. Copy the access Token ID, Secret Key, or download the env file as MUX does not keep this.